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Gday Roger
First comment i have is that using raw bolts like that may not give accurate ( correct ) results unless their shafts at the point of measurement are the exact same dia and they are perfectly circular. Tho your results appear quite good if repeatable.
Just for info, as you rotated the OTA, how much deviation did you get on the dial indicator??? Ie how concentric was the bolt to the DEC axle axis?
I use a set of match made trunnion extensions to eliminate this problem.
To do this, i turned up some alloy bar and machined a section in the middle
then parted this off in the middle.
Thus both trunnion ends are 99.99% identical in dia.
I then put the extensions into a collet chuck and faced off the ends that fit to the scope to ensure they were square.
Andrew
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