Oh geez, finally got it rebuilt and working. What a pain in the ass that Tamiya rotation box is. Offset to one side to you have to clear it with elevation turning to the right and then clear it again when rotated around on the back end of the servo mount.
And, since I have my elevation servo in there, I had to make sure the recoil servo wouldn't hit it or I would loose depression. Finally found the sweet spot.

I took the drive gear out of the rotation box so I could do various mock ups and spin them around by hand and test up and down movement of the gun. Its all very tight, especially when the wires of the two servos, the IR, the base and the flash and an Mg all get in the damn way.

I settled on moving the servo forward about 1/8 inch and across to the other side of the bar but flush with the edge of the bar. Then I had to fabricate a big Z bar for my recoil arm on the servo. What a darn pain it all was.
Sorry, I didn't take any pics while I was working. I just powered through it one try after another.