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Twinmaser DIY Power mods

Discussion in 'Air Pistols' started by Peter B, Dec 19, 2017.

  1. Peter B

    Peter B Well-Known Member

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    My recently acquired Rohm CO2 Twinmaster was averaging around only 2ft lb over a mag of 8 checked with a Combro 625 using RWS Meisterkugeln 7grn pellets.

    So I sent an email order to Nick Hulme at Magic 9 Design for the Twinmaster power upgrade kit but got no response. I phoned Nick at Magic 9, no reply, texted him, no reply and with no reply to a couple more emails I had to assume either that Magic 9 Design is no longer trading or that Nick is on long-term absence for some reason. Anyone know what's happened to Magic 9?

    So I decided to do a power upgrade on the Twinmaster myself.

    First of all I put a 5mm preload spacer on the trigger spring, picture 1. This lifted the power to an average of 2.3ft lb over a mag of 8.

    I then opened out the gas ports in the exhaust valve using 0.040” abrasive cord, picture 2. I was very careful not to nick the rim of the seal on the valve because that would have done for it completely.

    I looked at making a hammer weight but I haven’t really got the tools and equipment to make one and I think the hammer on the Twinmaster is made of phosphor bronze and I didn’t fancy trying to drill into that to attach a weight.

    So that was all I could do at home.

    After opening out the valve ports I reattached the Combro and fired the pistol expecting the power to have increased..........but it hadn't. The Combro read exactly the same as after the preload mod and before the valve port opening, around 2.3 ft lb. So the valve port mod had no effect whatsoever and I was disappointed that the mod didn't do what it is reported to do and increase the power.

    Any suggestion for other power improvement mods on this pistol would be greatly appreciated.
     
    Last edited: Dec 19, 2017
  2. Douglas Soal

    Douglas Soal Donator

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    Think Nick went out of business, I know he was very often very late getting work done for customers, and hard to reach.
     
  3. Nobbi1977

    Nobbi1977 Donator

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  4. Peter B

    Peter B Well-Known Member

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    Yes, I posted on that thread and as I said there my Twinmaster is CO2 powered, not precharged air, very different power control systems.

    My pistol works by the CO2 expanding explosively and massively from its liquid state in the CO2 capsule to its gaseous state when the exhaust valve is opened by the hammer strike.

    Totally different from compressed air.
     
  5. kyle2

    kyle2 Member

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    Contact ryboytastic in this forum. He services and mods Rohms's. About to send him one of my Twinmaster Trainers to upgade.
     
  6. Peter B

    Peter B Well-Known Member

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    Thanks, I've just done that.
     
  7. kyle2

    kyle2 Member

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    Cool, he knows what he's doing.

    Under no circumstances use Magic 9. He wont respond to my requests to return a Twinmaster Sport I sent him in early March (!) for modifying. Last 4 digits of the serial number are 5172 if you come across it. I'll catch up with the POS some day.

    If you are still after a manual one of mine came with an Action manual which is a similar model. Do you want a photo copy?
     
  8. Peter B

    Peter B Well-Known Member

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    Hmm, that's not good news about Magic 9. It's one thing going out of business but to do so with people's property still on your books and not return them is not right, and probably illegal. I think there are some web sites which will get you an address from a mobile phone number but I don't know what's involved.

    I'm OK for a manual now thanks. I've stripped the pistol several times now so I know pretty much how its put togther and how it works. I came across this drawing on one web site which I found very useful and using an on-line translater was able to identify the parts from the associated parts lists. The item 470 on the drawing is listed as 'Flachdichtring' part No 898780. This translates as 'flat seal ring' but I haven't got that item fitted on my Twinmaster exhaust valve an I'm wondering if this is the problem with mine.

    Anyway, I look forward to a reply from ryboytastic and thaks again for the link to him.
     
  9. lmt

    lmt clapped out aviator

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    Did some work on my air powered version of this, it is highly sensetive to barrel gap. I gained 100fps by reducing this.

    If you want to set this, the 8 shot mags are thinner than the single shot tray, I set mine to about 1.5 thou using my thinnest feeler guage.
     
  10. Peter B

    Peter B Well-Known Member

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    Saw your excellent post on the other thread about this and noted the point about the barrel gap. You're in good company with that advice because ryboytastic replied to my PM for advice and also suggested looking at the barrel gap by closing it until the magazine just doesn't go in and backing it off until it just does. Haven't done that yet but definitely will.

    There's something very odd going on though with the spares drawing I posted above. According to that drawing there was an O ring missing from my Twinmaster exhaust valve. Luckily I found one here: http://www.airgunspares.com/store/product/8283/Rohm-Valve-Nose-O-Ring-Seal-Part-No.-ROS233113/ Same part number as on the drawing but when I fitted it in the position shown on the drawing the valve leaked like a basket and wasted the CO2 cylinder. Very strange.

    I think at this point I give up and give ryboytastic a shout in the new year to do a job on this pistol for me.

    Thanks for your help and advice anyway everyone and have a great Christmas.
     
  11. monty47

    monty47 Engaging Member

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    Is there a how to for this my mags are quite loose
     
  12. lmt

    lmt clapped out aviator

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    Hi Monty.

    There is a cylindrical nut that locks the barrel into the frame. It has a castellated top that needs a tool to undo it.

    I didn't have this so I used a piece of thick rubber pipe and mole grips to loosen it, a piece of belt leather may also work.

    Once loose the barrel is threaded into the frame so it's just a case of turning the barrel to achieve the required gap.

    As I mentioned, I set mine as tight as I could get it using the single shot tray, the 8 shot magazines are slightly thinner.

    Once you get the gap adjusted, you just have to tighten the lock nut again.
     
    monty47 likes this.
  13. PhatMan

    PhatMan Posting Addict

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    Hello to All,

    I had a dreadful experience with Magic 9 Designs & Mr. Hulme, and never used him again :(

    His excuses were laughable :(

    Have fun :)

    Best regards

    Russ
     
  14. garryt

    garryt Engaging Member

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    I don't think Nick has gone out of business. As far as I can tell, he's just lost interest and can't be bothered to reply to anyone.
     
  15. monty47

    monty47 Engaging Member

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    I've been in touch with him regards a weaver rail, it's been a few weeks since I last heard from him
     

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