A contractor from New Jersey says:
August 5, 2015
I have a 13 1/2 in operator to replace. Your 39-399 looks close. The one I have is surface mounted and mounted with two machine screws to the frame. Does this operator have the two threaded holes for the frame mounting? Also. What are the hole spacing dimensions? There is no diagram with the measurements.
Dave from SWISCO responded:
August 6, 2015