Mr Carcharodon
Contributor
There is a bolt that holds the swivel on. It has a hole drilled down the middle to let the air through. Because there is material removed it is somewhat vulnerable to being overstressed. This bolt has to be removed during servicing to clean all the parts and replace the swivel o-ring and shim washer. The service manual specifies a torque so the retainer bolt is not over stressed. I think most shops rather than doing this with a torque wrench do it "by feel" which is an unreliable approach. And it causes a lot of failures. Since it failed so close to the servicing it is likely it was the shops fault. I would ask them if they torqued they retainer with a torque wrench, and ask to see the torque wrench. If they can not produce one they should do the repair at their cost. I would guess the retainer is only a $20 part in any case. But they should not charge you to reservice your reg if they did it wrong the first time around.