Inner snap ring-2
The inner snap ring fits the groove inside the Saturn hub.
The original Warn hub DOES NOT have this groove! This is one of the Warn/Saturn parts incompatibilities:
You can use a Warn flanged mainshaft w/the Saturn hub, but you have to omit this snap ring.
You CANNOT use a Saturn non-flanged mainshaft w/a Warn hub (since it DOESN'T have this snap ring groove), unless you have the groove machined in. Saturn does provide the specifications for this groove.