Casement operator needed

Quick Learner from Newburgh, NY
Please help identify the operator needed for this window. The operator keeps getting stuck on the spline and easily falls off. Seems to operate smoothly, otherwise. Identifying numbers are in photos. 9 1/2" arm. Thanks.
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Bob
Bob from SWISCO
SWISCO
Expert

Thanks for posting. If the spline is wearing down, it is indeed generally a sign that the entire operator should be replaced. I believe you have our 39-155 and 39-156 style dual-arm operators, but make sure the dimensions we list below exactly match what you have. Let me know if anything differs in any way. or new covers and handles, see the 39-107 and 39-114L.

Dimensions for 39-155
Dimensions for 39-155

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