The original did strip. The transmission shaft looks like it's ok. I intend to tap to a larger size bolt unless I can fit a lock nut underneath. The flange is going to be ground down if I use it.
I may be hitting the shifter too hard. It was loose and I may stripped it by over tightening. Not sure why it stripped.

 

Never mind. No way to fit a nut under the linkage.

 

I don't think a larger bolt will work, either, as it likely fits into a groove on the shaft. Thread repair or replacement probably are the only options.

 

So the splined part of the linkage is stripped. You will have to replace the linkage. Get the correct bolt and torque to factory recommend spec. Take it easy on the shifter arm pressure, lol. You don’t need to stand on it.

Dave

 

As John CC says, a larger bolt probably won't fit the shaft groove. Then you're into grinding the groove bigger to accept the larger bolt. Helicoil or similar to repair the threads which will cost you $20 or so or replace the shift arm. Too bad you can't get a nut on the end of it. I've seen repairs to stripped grooves done with a Dremel and fine steel rods in places so they'll grip.

 

Welp. The tapping didn't work. The linkage is toast. The shaft splines are in good shape. Time to remove the primary and replace. Better Lever it is.

 

According to the other thread you can slip the new part in without removing the primary, an you've got nothing to loose with the old one...

 

No room to slide off the old one.

 

Looks like it's dependent on the model year whether there is enough clearance to tilt the lever inboard and slide it out. There's still another alternative in the first link below, so you don't have to remove the primary.

Save Time And Money | Transmission Lever Swap Out
https://hotbike.com/save-time-and-mo...ever-swap-out/

Better lever Harley spline shifter lever removal

You Tube

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Break it. The worst case is you end up removing the primary to get the new one in. Best case is you don't.