Dave Sr. from SWISCO responded:
May 25, 2016
Thanks for posting. Our 39-513 and 39-514 would take a #8 pan head screw like the 33-090. However I'm not sure of the length. You could ask a local hardware store and see what length they recommend, if you don't have your old screws handy for reference. You could also show us your existing operators and what type you will be using.
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