first out's silence cocking knob mod
       Does your cocking lever rattle?  I stopped that.

1)Remove the cocking lever from the gun.
2)Use a degreesing solvent and clean it.
3)put as much masking tape around the part that fits
into the hammer as you can and cun the holes
out.(make sure no tape sticks out past the edges)
4)Reinstall and enjoy a quieter gun.

If it still wiggles then you may have to enlarge the
hole in the reciever for it, to get enough tape on and
still get it through that hole.