I have a problem with a caster which has fallen out of an antique oak office chair. The stem, which is 1-1/2" in length, end to "shoulder", has a taper from 5/16" to a loose 25/64", with 25/64" being the opening in the Dewalt drill gauge which slides completely on, but with significant slop. You do not offer an information on tapered caster stems, and maybe you don't sell that type of hardware, but if you could add info to this video, I for one would be grateful.

And for measuring the hole?