Here's the drawing of the gear selection mechanism: I have now had twice the shift lever item 12 coming off item 10 gear selection lever. o'ring items #14 is what limits the lateral movement of the shift lever item 12. I believe I am missing the spacer #15 and bushing insert #17 that keeps the first o'ring in place. The axe of the shift lever has two grooves in which the o'ring sit. In my situation, there is a 7mm lateral play, and with repeat gear changes, get the shift lev