Tom from SWISCO responded:
May 5, 2016
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.
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Tom from SWISCO responded:
May 6, 2016
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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