Hi Dave,
I'd have to drill out the screw/nut because they're rusted in after 25 years, which would leave me with an inoperable window that could be opened from the outside.
It clearly doesn't currently have a threaded hole on the arm, but rather a bushing/insert in the 3/8" hole with an internal thread to accept the screw. That's why I'm puzzled how to attach a new crank.
As far as dimensions, I have measured the hole distances as my set up can handle either a RH or LH operator - 5 1/4 " OC for the top and bottom holes, 1 1/8" for the bottom holes OC. The operator arm is 2 1/2". Both the ones I want to replace are RH
In short, I think either the Superior Window Crank or the Silverline you speak of with the thread, as long as I have the correct hardware to attach the arm to the existing mechanism.
One way to hedge my bet is to buy the 2 LH silverlines with whatever attachment hardware you recommend (I think it's the
33-070 screw with the
33-206 bushing, right?). That way I could "make" the LH crank connection and verify it works before "breaking" the RH legacy crank by drilling it out.
What do you recommend? If you think the best bet is to remove one of them, I'll drill it out and send pictures, but I'm sure of the dimensions.
