Hop-up ajustment wheel screw getting loose
 

Every time I ajust the hop-up the ajustment wheel screw would move with the ajuster wheel and become loose after a while and no longer hold in place.

So I came up with this fix by putting a small mech-box gear shim on it.

I put the shim on top of the ajuster wheel then I put screw back in and now when I ajust the hop-up the screw no longer moves.

or just glue it down :b

Some metal body tolerances are really tight, so if you can't fit a shim in there (or don't have one), you can also sand down the post that gear mounts on to make the wheel tighter.

put a small pice of ducktape on the back of the wheel...it works

You can put a shims just like a washer before the screw.:)

Did you notice you just repeated the same thing as in the first post of this thread? :p

Then you would never really use a different weight BB. :)