This knob in an old trailer of mind broke off. Is it possible to replace it?
I'm curious if the aluminum "thread" that inserts into the knob has a name or standard. You can see what I mean in the first picture.
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You can be certain that the thread is a standard size. Take the screw or a similar one to a hardware store and they will help you find a matching one.
As was mentioned in the comments, the attachment looks very much like a standard window crank. I would bet that a search on Google or the like would turn up some sources.