help. One last mod I need to do...transgo 2 shift kit...

Obviously the finished piece is absolutely non-critical, just look at the "slop" in the dimensions. If I was doing this, I'd either use a grinder just like they suggest, or I'd take a scrap soda can (soft aluminum!!) and cut a strip long enough to wrap the small end about 2x, then just chuck it in the lathe and turn it down.