39-138/9 quality, gasket

A handy person from Massachusetts says:
I'm thinking I could use some of the cheaper, 9" options that match my existing mounting hole patterns (though my arms are 9-1/2")
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Tom from SWISCO responded:
Thanks for posting. I'm sorry, but I'm not sure what your question is. Can you go into more detail? What about the 39-138 and 39-139 would you like to know? If you're wondering if they can replace your current operator, I would need to see a picture of your existing part removed from the window. That would allow us to find the best possible match.
A handy person from Massachusetts says:
Sorry, I thought the second part had posted. I was wondering what the quality difference might be between the 39-038/9 and 39-001/2 operators (beside the 1/2" arm length), and if there's a risk in replacing a 9-1/2" arm with a 9" arm.
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Tom from SWISCO responded:
Thanks for clarifying. Other than the length of the arm, the wheel bearing at the end is different for both operators. Honestly, we recommend sticking with what you have now. In terms of quality, neither operator type is necessarily better than the other; we find that they both work equally well.
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