Seeking new crank operation mechanisms

Question

Hello: Our worn-out window crank mechanisms are stamped TRUTH. One has number 31272, and another has the number 40887. A third one has no visible number. They seem have the same or very near the same measurements.

Photos are attached.

Can you offer help to us?

Thank you.

Emily · Accepted Answer

Hi there!

Our 39-171 and 39-172 operators were the first to come to mind. However, your link arm looks shorter. Ours measures 5" long as shown below. In cases like this, we've recommended drilling out the old and new arms. You would then have to install the old arm on the new operator with the 62-014B rivet. To install this rivet, you'll have to hammer it in; I recommend doing it over a metal plate if you have one.

Dimensions for 39-171

Dimensions for 39-172