Airsoft Canada - View Single Post - Can a stock TM gearbox be modified to use 7mm bearings?

mcguyver · January 29th, 2006, 23:11

I tried to do this once last year with a reamer and drill press. The problem that I ran into wasn't getting the hole size corect and centered, but rather the "flange" on the bushing. It needed to be recessed more into the mechbox than what the original 6mm ones were. It extended too far into the box and was very tight on the gears with no shims in the box. this would have required very fine countersinking around an already thin hole to make it work and rather than try it and waste a bunch of time, I just abandoned the project and got a 7mm box to work with instead. I'm not saying that it can't be done, I just feel it's more effort than it's worth considering the cost to you in U.S. $$$ and any potential benefit of just outright buying a 7mm box, which will be reinforced anyway.

January 29th, 2006, 23:11	#4
mcguyver Trader rating Join Date: Aug 2005 Location: Northern Alberta	I tried to do this once last year with a reamer and drill press. The problem that I ran into wasn't getting the hole size corect and centered, but rather the "flange" on the bushing. It needed to be recessed more into the mechbox than what the original 6mm ones were. It extended too far into the box and was very tight on the gears with no shims in the box. this would have required very fine countersinking around an already thin hole to make it work and rather than try it and waste a bunch of time, I just abandoned the project and got a 7mm box to work with instead. I'm not saying that it can't be done, I just feel it's more effort than it's worth considering the cost to you in U.S. $$$ and any potential benefit of just outright buying a 7mm box, which will be reinforced anyway.