Loose shifter arm on the transmission

To remove that arm, the inner primary must come off, but try this first:
About 75% of the time, just replacing that allen screw will solve the problem. Don't just tighten it, replace it. Make sure the arm is slid all the way on the splines. The screw usually doesn't loosen, it stretches.

You must pull both inner and outer primary, then the top cover to the tranny. After all of this has been removed, you can get to the shifter cam and pawls, and replace. I have done a few of these. The splines wear down and then just simply turn back and forth.

IS the heel toe shifter loose . That's a easy fix, just remove the heel and toes shift (Remove the allen Bolts) and then a nut behind the Primary cover pull out the rod and the bearing replace rod and bearing and new heal toe shifter , Reassemble , Don't forget the rease on that grease fitting

Once that arm gets loose you are done for, you might get away tightening it but you are best off replaceing it yes the primary has to be removed and the starter needs to be un fastened at the starter shaft and at the starter where it fastens to the tranny but when your done the trouble is gone and the shifter fixed

You might get to it with a long 1/4 inch alen socket but generly they wont tighten till u get the primary off