casement window crank and cover replacement

Question

I would like to replace this with a folding crank, 39 107FK. If not that, then maybe a t-handle? How do I determine the size of the spline or bore?
On the inside of the cover it says "Truth"

Jasmine · Accepted Answer

Hey there,

Thanks for posting! The 39-107FK should work just fine to replace your existing handle and cover. Almost all Truth brand operators have an 11/32" spline measurement, so I'm pretty confident this will fit your existing hardware.

To confirm the spline size, you'll need to measure the diameter of the spindle; the piece the handle attaches to.

View of 39-107fk unfolded