Got a 100T from another generous member on the board from the PIF thread.
Drilled it out and filled it with some hot glue and pennies to give it some heft. Finally bought a 22 Black badger from Whipped Dog, talk about great service! Anyway, set it down around 8 mm into the handle. Pretty happy how it looks, we'll see how it lathers up later. I was tempted to go with 24 mm but i think 22 is as big as it could take without taking out the core rubber and risk the stability of the brush. Anyway current pics pre-bloom: