ENTRYGARD operator R30842

A handy person from california says:
what is the SWISCO part number to order?
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Tom from SWISCO responded:
Thanks for contacting us. Please take a look at our 39-031 & 39-032, EntryGard Dual Arm Operators. Do these appear to match your own hardware? Let me know!
A quick learner says:
yes, 39-032 looks to match. The nylon roller on the tip of the operator arm pops out of the track, at the installation cut out., when I open up to about 45* degree. This roller looks worn and out of round, from repeated snap-ins and pop-offs. Is this normal wear and tear or the wrong sized? operator. I have no problems whatsoever with other similar windows elsewhere in the house.
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Tom from SWISCO responded:
It would depend on how old your original operator was and how often the window is used. It's natural that a roller will, over time, start to wear down.
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