Pen kit equivalence/compatibility
So far the pen kits I've purchased were from Woodcraft and I've got a few Woodcraft bushings and their pen mandrel. The kits I've turned so far are the Wall Street II, Toni, American Slim, and multi tool pen kits. I've noticed very similar looking pens on the Packard, Craft Supplies, and Berea Hardwoods sites and assume there are fewer manufacturers than brands out there.
I can guess (but haven't verified) that the Wall Street II is the same as the Berea Sierra, Craft Supplies Sienna, and Packard Gatsby. What I don't know is which suppliers bushings are compatible with other manufacturers mandrel shafts - for example I know that Berea has 2 diameters for mandrel shafts and their multi tool pen kit requires the thicker mandrel shaft, but from Woodcraft the multi-tool pen kit uses the same mandrel shaft as all the other kits, but I assume I could use either companies kits for the bushings I have.
Obviously as a consumer I'd like to not be locked into any one companies kits and tools, though that's clearly their intent by being vague with the specs for things.
Has anyone started to compile a tools/bushings/kit compatibility/equivalence table somewhere?
On a side note I'm not familiar with gold plating specs - which is better 10k or 24k gold plating?