Dave Sr. from SWISCO responded:
January 17, 2018
The operator you purchased last February is an older style Silverline operator, which is no longer available. What I've been doing is using our 39-025 and 39-026. These operators are very close in size and use a threaded sector at the end of the link arm, which eliminates having to use a shoulder bolt. Look at the hardware suggested along with the related video and see what you think.
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