Thanks for the pointers. I went ahead and bought a new tensioner rod and also a tensioner. I don't want to have to take it apart again soon.
Do you recall which way the rod cam attached to the tensioner? It seems to be able to fit with the connector end of the rod either between the tensioner and the cam or between the cam and the inner bracket face. Maybe it doesn't make any difference but the way I have it the tensioner nut doesn't seem to want to fit in the rounded area of the hole where the nut comes through.