On a six unit apartment building, converted from church to apartments about 20+ years ago, the Pella window crank 'male' part has all the teeth worn off. The crank was installed and then the wood window frame was installed around it. I have tried to drill through the crank and insert an an expandable "shim" (may be wrong word). Even with "hard steel" drill bits, it only makes a tiny dent. There are about 55 cranks that need to be repaired or replaced. I have contacted a Pella dealer, but they do not sell just the parts; they have to do the work too. They quoted me $90.00 for a 18" x 48" screen replacement!! I feel that there should be a way to replace just the male part and then put a standard handle on it. I'm a dyi landlady and have not won the lottery to pay that kind of money. There are about 55 cranks that need to be repaired or replaced. I have contacted a Pella dealer, but they do not sell just the parts; they have to do the work too. They quoted me $90.00 for a 18" x 48" screen replacement. (That's was $39 for the screen and $50.00 for shipping).Pella does not sell the screen frame for dyi and they have a different screen/frame connection.
If I am correct Pella windows are wooden frame windows, maybe some other window company will be able to repair it.
Good Luck