Dave Sr. from SWISCO responded:
May 10, 2016
I tested the 39-157 out right here by installing it onto a Truth operator with a 11/32" spline. I placed the extension onto the operator and secured it with the set screw and it seems to hold onto the operator without a problem. This extension is made by Truth to fit with their operators. Make sure that set screw is tightened down all the way onto the spline of the operator. If you want, send us some photos of the operator and the extension for us to take a look at.
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