Is the bearing in the 81-133 replaceable?

A quick learner from Okeechobee, Florida says:
Greetings,
I think my doors are in need of this part. I was wondering if the bearing itself is replaceable, or does the assembly need to be changed out?
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Tom from SWISCO responded:
It in fact would be possible to replace the wheel with our 81-237 nylon wheel and 81-310 axle kit. Personally, I would prefer to replace the complete roller assembly if it is available.
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