Polls window cranks

A home owner from Pagosa Springs, CO says:
I bought my house in 2000. It was built around 1980 with double glass Pella crank windows. The cranks on my kitchen windows work to a point and then they seem to strip out and lose their catch. I have to get them to latchcl them from the outside using a ladder. That's a real pain. Anothert pain, is replacing the windows. Then I got this brilliant idea to use the Internet and see what I could do.My Internet search limit led me to you. Can you help me? I've included photos. These Pella windows date back to around 1978-80. Any help would be appreciated. Thank you very much
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Casey from SWISCO responded:

Hello,

Take a look and compare the specifications of our 39-175 and 39-176 Pella operators to yours. These operators use our 39-109B handle. Thank you!

39-076 : Center Gear Operator
Center Gear Operator
39-076
$39.97
VIEW >
39-175 : Sash Crank Operator, Pella
Sash Crank Operator, Pella
39-175
$240.97
VIEW >
Anatomy of a casement window
Anatomy of a casement window
VIDEO
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