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Tom from SWISCO responded:
July 8, 2019
I'm not sure exactly what you have, but I have a few ideas. Start by looking at our 39-139. This looks very similar to yours, in terms of design, and is made by Truth. Those are all positive points. I also suspect your arm is closer to 9-1/2" if you measure if the same way we do, which is from the center of the gear to the center of the wheel at the end of the arm. However, there are a couple of things that make me hesitate. The first is that I don't know if the wheel at the end of the arm is the same style as ours. You'll have to compare it to our photos of the 39-139 to confirm. You'll also note that our operator has front-mount installation holes instead of rear-mount, like yours. This means you'll need a 33-205 thread nut to allow our operator to rear-mount to your sill. Aside from those differences, I think this is our best match. Let me know what you think! |
