Dave Sr. from SWISCO responded:
July 20, 2017
I'm not 100% certain, but I believe you could have an operator made by Truth hardware. Check to see if there are any names stamped on the hardware. If it is made by Truth, you would have an 11/32" spline size, which is just a little larger in diameter. Take a look at the 39-247 and 39-336 pole ring adapters. These all work with an 11/32" spline. Since your operator spline stem is kind of on an upward angle, I personally think the 39-336 might be a better choice. See what you think.
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