Milgard casement window Series # 3510 P.L. 032-167 Tee or disk crank handle

A home owner from Seattle says:
I want to replace the standard crank handle with a Tee or disk handle. What is available?
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Dave Sr. from SWISCO responded:

It's hard to say based on just the brand of the window. If memory serves, I believe Milguard casement windows used Truth hardware. If so, they should accept an 11/32" handle spline. Take a look at our 39-102, or even the round 39-115.

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