That big snap ring is for removing and replacing the ball joint.

 

 

After installing s2 rca's (yesterday), today I went for alignment... Finally the car has a correct geometry (for my standards for a track)

Front

Camper -3,5 degree (room until -4,5)
Caster 6,5 degree (max out at 7)
Toe out 2mm TOTAL

Rear

Camper -2,4
Toe in 4mm TOTAL

At the end of July the car will be on square setup and after taking some tire temperatures I will make some corrections, if needed.

Thank you all guys for all the help and opinions. It seems that if someone wants to play freely with caster and camper, s2 j's rca's is the only way.