A833 Four Speed Gets Stuck in Reverse

OK, think I’m good now.
I loosened all cover bolts and disconnected the reverse lever at the cover. I was able to push the cover up. I tightened the two side shoulder bolts. I put the reverse lever back on, tested it out and got more good shifts out of it this time, but then it locked again.
I pulled the reverse lever back off and put a 1/4” wrench on the reverse lever shaft, and I was able to go back and forth into neutral and reverse, counted 30 times with no problem. Now I’m thinking it’s the shifter.
Got my home made tool (pictured in post 16), tried putting it thru the shifter slot in neutral, and ... no go! I ended up putting two more turns on the reverse rod to get the tool to slide good into the shifter slot.
Problem solved (for now, at least). In retrospect, I think it was a combination of the two issues, the cover and the reverse rod both needing a little adjustment.
What I didn’t understand was how barely loosening the cover and pushing up could possibly help. After finding and watching the Chrysler filmstrip, all your advice posts made sense.
Thanks guys!!!!!