Weathervane casement replacement knob

Question

I'm trying to find a t-crank or hand knob for a weathervane casement. I've found a bunch of these t-handles but my problem is that I don't know the size of the spline.

User submitted photos of a window operator.

Paul · Accepted Answer

The size of the spline is probably the most important part. We highly recommend measuring it as carefully as you can to confirm what you need. Otherwise, it looks like you might have Truth hardware, which use an 11/32" spline. If that is the size you have, check out the list of parts I made for you on the right side of this page.