Jaegers 6" f/10 "GJD" OTA Construction - OTA Handles (mark location of "O" OTA handle holes)
 

Marked opposite side of Handles Support with an "O" to make certain they were installed evenly spaced - 10 (Click to see an enlarged image.)

 
Without going into all of the detail explained on the page before, here are the marks made for the "O" designated OTA handle. I believe you know the rest. :^)