Replacing jalousie operator

A home owner from Florida says:
Crank just spins and doesn't move window. I am unable to remove the bolt that attaches the lever that I am supposed to b able to remove. Any ideas?
This house was built in 1979. Thank u for your time.
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Tom from SWISCO responded:

Thank you for your patience during this busy season. It's very difficult to identify these while they're still installed. The style of the link arm, especially the size of the hole at the end, is a vital detail. You can consider our 39-012, 39-061, 39-194, 39-252, 39-278, 39-350, or 39-378 to start out. These all have a similar hole pattern compared to yours, but it will come down to your precise dimensions and the style of the link arm.

As for removing the link arm, these are usually attached using a shoulder screw or "e" ring. The shoulder screw can screw off and the "e" ring can be popped off with a screwdriver. If yours is riveted on, though, then your only option may be to drill it off.

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