Valve spring washer made of hard coating aluminium.
3mm initial BMW tension increases the final pressure about 10 kp.
TAKE CARE!
Please do not rely solely on calculated dimensions, but check all values once again on the assembled engine! Check in all cases the clearance between valve retainer and valve guide!
for BMW spring pocket and valve collets
You need 8 pieces for one engine.
The kardan is fixed with 4 screws.