First you need to understand what an inverted shock is,
The full shock in black, the beside them the inserts, they larger shaft size slides inside the housing in a Teflon sleeve bearing, this requires grease for lube, the grease used by factory is really bad, so drill and tap to fit grease nipple between the two sleeves, i drill into the body where the spring platform is in contact with the body, it is double thickness, there is grease in there, so shavings don't go in, blow it clean sideways and it leaves hole clean, pump it with grease gun, take 6-10 pumps and goes hard, this then means the housing between the bearings is full, this LMM grease go more like a liquird when warm, same grease as used in drive shafts, extreme pressure and best thing. You don't go near the pistons or gas, that is in the insert.