![]() This knurled broach is an example used for illustration only that was recently machined as a Demo. The cutting action of the broach eliminates stress on the plastic part and produces interlocking splines that far exceeds required strength. The nose of the knurl is machined at an angle creating a sharp cutting surface and a pocket for chips to accumulate in per the photo. Construction of such a cutting broach can be seen in the attached photo and should be self explanatory. ![]() Thus, I would first broach the hole with a knurled cutting broach identical to the knurl of the inserted arbor. ![]() However, inserting a course knurl into a plastic hole would risk breaking the part due to the stress applied to the part. My personal method of doing this would be to apply a course knurl to the inserted arbor since we are dealing with plastic. Adhesives are very unlikely to equal original or functional strength. As some others have mentioned, you should be able to drill out the broken part and insert a new brass arbor assuming it is done in a way that preserves the integrity of the remaining plastic part and equals or exceeds original strength. While I do not have the items in my hand, assuming you cannot get a replacement and if my assumptions are correct, from what I can see in the photos, repair would be quite easy with a Lathe or by someone who has one.
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