[AngelWolf]

Bear with me here.
I have a TM m4, and I am missing a piece.
Said piece is a small piece, that fits between the plate at the bottom of the handgrip, and the motor.
Its the piece that tightens your motor, and you use a small alan key in the bottom of the hand grip to tighten it and push said piece farther into a small circular metal part on the bottom of the motor.

Now if anyone followed that and has any idea what the hell I am talking about, do you have any clue what that piece is called, and/or possibly where to find one?
I hope that made sense, and if it has been posted before, I apologize. I was'/t exactly sure what the search string should be.