Would it be a short-shaft on the Combustion?
I think the short shaft on the Afterburners is to address the countersunk bushings.
The Z and Prima basses have angled headstocks that eliminate the need for either a string retainer or the countersunk bushings.
Quickly glancing at a few images, it looks as though the AB series is mainly the only model to be short shaft (post that string winds around). It does look as though the Z has a B short shaft in one image with the rest of the tuner's shafts being "normal" length.
25 weeks to go. Does anyone know when the order is set in stone? I'm not contemplating any changes (still holding steady after 11 weeks), although those new alnico PUPs are visually appealing, I suspect they are also heavier than neos.