Awning window cranks

Question

My operator is very close in dimension to 39-026 except the bottom mounting holes are 1 1/8" center to center, and the arm length is 2 1/8". Slight differences both. The length is exact.
How would the arm length difference affect operation? Is there a better fit with another model? I can't find one. The original is 10 years old, made in the USA. No manufacturer or model number. The windows are aluminum and I believe manufactured in the Philadelphia area.

Dave Sr. · Accepted Answer

The 39-026 operator was popular in the Philadelphia area. The bottom holes on the 39-026 are 1-3/16", which is only 1/16" off from yours. If it is a problem when you mount it to your window, you could drill the holes out to be a little larger in the casing. That should give you a little more wiggle room. As for the arm difference, I don't think any adaptation would be necessary. You should have enough travel to make up the difference in length.