39-089 vs 39-187?

Question

30615 / 30894 on crank mechanism
Unsure whether to order 39-089 and 39-090, or 39-187 and 39-188.
Thank you for your assistance.

Jasmine · Accepted Answer

Hello,

This window operator appears to have a w-shaped gear arm like the 39-187 and 39-188 Sash Dyad Cranks. Given of the arm, I believe the one in the photo is the 39-188.

The compatible hardware and accessories can be found in the related products.

Alternate measurement of arm