(above) I had forgotten about viscosity improvers, been too many decades. Yep.
I also save those Talenti jars! Dental acrylic, that's hilarious.
Gosh I would think that a long enough soak in solvent would dissolve the grease, but maybe it would need ultrasonic. Of late, I use tiki torch fuel as solvent as it's 98% mineral oil and mostly filled bottles are dirt cheap at goodwill at the end of summer. Works great as chain cleaner in Park Tool on-bike chain whirlygig.
Gears being timed/clocked, interesting! Must be something non-symmetrical on the same body (like a cam?), otherwise doesn't make sense to me. I'll have to think about that, perhaps look at an exploded view.