5 friction/clutch clearance issue in a 904

isnt that spirol snap ring for you spring retainer? it shouldnt affect your stackup.

Agreed. That snap ring isn't in any proximity to the clutch discs so there's no way it will affect the clearance. All it does is hold the spring retainer in place. It's double wound to provide extra protection against breakage due to the extra spring pressure in the multi spring pack