There are two parts to these, the insert (or bushing) and the screw-in post. (Other names are the anchor and post!) Unscrew the posts from the bushings, then put the masking tape around the threaded parts of the posts until it is just smaller than the diameter of the bushing.
The inserts are a very tight fit as friction holds them in place. They will go in after the body has the finish on.
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