dragonfly/stingray replacement - nº22 noise damper o-ring (2 pcs)

Dragonfly/Stingray spare part. The noise damper o-ring is located under the inner piston to work against noise. To replace it, you need to drive out the needle bar pin, remove the cover and the adjusting screw. Put some grease on the new o-ring before installing it and make sure it is flat in the bore before inserting the inner piston.