SWISCO - The Replacement Hardware Authority

difference between pairs of operators

A home owner from Dayton says:
What is the difference between the pair 39-155 & 39-156 and the pair of 39-031 & 39-032?
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Donna from SWISCO responded:
They are very similar, the difference is the size of the short arm. 39-156/155, listed as Caradco, (sometimes arm is stamped 20755) the short arm measures 3-13/16". 39-031/032, listed as Entryguard, the short arm measures 4-1/2".
A contractor from Portland, OR says:
I've got a client w/ some failed casement operators, stamped Truth Entry-Gard. Can't see all the numbers on the arms- looked like one was R308xx, another 30842x, and I also saw 20810. Anyway, the reason they failed is the little knurled collar that holds the worm gear shaft has worked out of the housing. As an engineer, I look at the design and say that the operating forces are always going to be pushing that collar out of the housing and that failure is just a matter of time- the stiffe the window operation, the sooner the failure. Given my opinion, I'm reluctant to use a replacement with the same problems as the original. Got any ideas? Also, the original installer seems to have screwed the operators to the window frame, then installed the bottom trim/screen retainer OVER the screws, making removal & replacement somewhat problematic. I'm thinking maybe I can drill holes over the screws, do the R&R, then plug the holes, but that's gonna be kinda tedious. Got any advice?
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Dave from SWISCO responded:
To prevent the gear from pulling out, the home owner should crank the window close with minimal force then have the locks pull the window tight. To remove the operator, you must remove the bottom screen sill cover to expose the operator screws. Pry the trim up carefully not to crack the wood, it's normally held in with small nails. We always recommend replacing the original hardware as intended by the window manufacturer.
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