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I don't know what Elmer's glue is. I used PVA glue mixed 50/50 with water.
Oh those are found on antique knobs. I've never seen inserts like that sold separately. I think you'd have to find an old knob and remove the insert.
Maybe you could use some square aluminium tube and epoxy it in??
They're simply called 'threaded inserts' (for wood). I got mine on eBay, but I've seen them in hardware and DIY stores too.
Make Traditional Door KnobsView Instructable »