My design just used grooves cut into the cylinder, which the two pin types would ride at different heights, so it didn't need to be any bigger. An insert, aka.

My design just used grooves cut into the cylinder, which the two pin types would ride at different heights, so it didn't need to be any bigger. An insert, aka. a rectangular metal bar with cuts in it, is inserted into a slot cut down the side to define the check key. The pins are either a standard pin, ⣿⣿, or a T-pin, ⢹⡏. The core is cut all around with a groove like ⣿⣆⣰⣿, which they ride at different heights. If the insert is shaped like ⣿⣶⣶⣿, it blocks the T-pin, but the standard pin can ride over the top. If the insert is shaped like ⣿⣇⣸⣿, the T-pin rides through the gap, but the standard pins catch. Again, details like depth and offsets matter, because you don't want it to be bumpable with fast or angry rotations, or for the two pin types to lock at distinguishable offsets, and you don't want it to be jammable. Boring standard fixes can deal with comb attacks. Enclave, OTOH, does need a bigger body, but it's merely a bit taller, nothing radical, and it's very easy to manufacture. It already has inserts to prevent comb attacks.