Ok, I'll stretch the glossary a bit to prove my point (not nearly as bad as the traction bar guy either!):

Bore - The diameter of a cylinder.
Rotary Piston - See Rotary Engine Rotor.

The Wankel housing has two chambers that appear to be cylindrical. It could be argued that the housing could be over-bored 0.040" per 9.1.3.D.1.j. Since the rotor is defined as a piston in the glossary, it can then be replaced with an oversize version per the same rule. The diameter clause may still apply since each of the three faces of the rotor appear to by cylindrical as well, and thus have a diameter.

Will this work? Honestly I have no idea, but I'd certainly be looking into it if I had a rotary...

Can we think a little more seriously about fixing this now?