Thanks for the ideas. I did figure out how to put the little dog part back in. Nothing to it once I figured out the way it all works. I just inserted a narrow strip of an old plastic credit card above the spring loaded rings and put the little dog on top and it slid right in. Then pulled out the plastic.
I'll check out the bearings and bushing, but it always stayed in the high gears, and super low, just 2nd was the problem.
