Hi,
I have a challenge with my Cyma Thompson. The motor seems to have slipped away from the gearbox and isn't meshing with the gears. The housing is all fine and solid. When I pull the trigger the motor whines but doesn't turn the gearbox. When I manually show the motor hard up into the gearbox (there is some play) then it works fine and fires. The challenge is that I can't find anything to adjust. I could manually shim the motor, but that doesn't feel like the right answer. On my M4 there is a little plate that sits at the end of the motor that allows you to adjust it's fit with the gearbox. But I can't see the same thing on the M1A1.
Any suggestions?
in the base of the motor housing there is a threaded hole that is also used for the screw that holds the pistol grip on ,further down inside the threaded hole there should be a grub screw for motor adjustment, they over do it with the thread lock so it can take a bit of fiddling to get the Allen key to engage in the grub screw ,unless of course our Chinese friends forgot to install it.
armoury
m1a1 Thompson,sten mk2,mp40,stg44,sterling,mk2 bren gun,lee Enfield no4 mk1,Mauser Kar98, Walther ppk,smith and Weston m10 and Mauser m712
Give me a big enough hammer and a place to stand and I could fix the world.
i'll kill a man in a fair fight or if i think he's going to start a fair fight or over a woman or.......
a problem shared is a problem halved ,but an advantage shared is no advantage at all
if a job's not worth doing then its certainly not worth doing well
Success!
That's what I was expecting to find but I was trying to find it with a screwdriver, not an allen key.
For the record, tightening it up fully with a 2mm allen key (not hard tight, just snug) then loosening it 2 full turns back works perfectly.
i usually do it with the trigger pulled ,tighten until it slows the rate of fire and then back it off a tad till maximum speed again, gives best mesh without friction.
armoury
m1a1 Thompson,sten mk2,mp40,stg44,sterling,mk2 bren gun,lee Enfield no4 mk1,Mauser Kar98, Walther ppk,smith and Weston m10 and Mauser m712
Give me a big enough hammer and a place to stand and I could fix the world.
i'll kill a man in a fair fight or if i think he's going to start a fair fight or over a woman or.......
a problem shared is a problem halved ,but an advantage shared is no advantage at all
if a job's not worth doing then its certainly not worth doing well
