Dave Sr. from SWISCO responded:
April 27, 2015
I pulled one of our 39-074 operators from our stock to check the hole centers on the back of the operator. They have 8-32 threaded holes for a machine screw and are 2" apart, on center. The front spline hole for the operator shaft is 1/4", and the side holes are 3/8" hex. I hope these measurements help.
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