New optional parts for A800R

Optional ST122-1 Damper screws with OR2005V O-Rings.

Benefits of this set are:
- ST122-1 doesn't need much tightening for good sealing. The thread in damper case will last longer.
- ST122-1 keeps better sealing at big expansion of the damper case in hot conditions.

contains: 

8pcs ST122-1

8pcs OR2005V