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39-187 Sash Dyad Crank, 5"

I have broken window opener. Could you please tell me what do i need: Sash Dyad Crank, 5" or Window Dyad Crank, 5"

What is the difference between Dyad Operator #39-089 & #39-187 ? These are the proper operators for my exisitng windows. I am looking for a high quality version for a salty beachfront environment. Ideally stainless steel. thank you rick s

According to the measurements on your websites 39-089 was the replacement part I needed. When it arrived it was obvious that it was not. They are 5" but the arm length is different. I am attaching 2 pic in the hihopes that you can help me identify the correct replacement part. Thank you for your ... (cont.)

The 39-187 looks like the operator I need. however, I have a 4.5 inch arm. will this work?