Bob,
I used a silver sharpie to mark a line across the "shear screw thick washer" and the servo arm. The arm would move about 2 deg. each way with the servo locked using the test setup. End of arm movement about 3/16"? I should of noted better. The castle nut was finger tight, so when I reinstalled I tightened just snug to the next cotter hole. The shear screw is a 6-32 brass capscrew 3/8' long. When it was loose it would rock back and forth, allowing movement.
When I do my pitch servo (lots of ele. movement) I will measure the arm hole vs shear screw. It did feel tight but not a friction fit. Just checking
![Wink ;) ;)](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
Trying to be clear-- there is some small servo gear lash. And after I re-assembled, the shaft to arm movement went away
![Smile :) :)](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
Hope this helps.
PS If anyone works on this you have to make sure the shear screw
will break as designed. Not all glued up etc.