Anyone have any experience replacing the solenoid on the auto drain for the Bauer Mariner II compressor? When I opened it up I found that the plastic plunger was cracked. I ordered the replacement kit (includes piston, spring assembly, plunger, and o-ring) from Bauer, but I am not sure where the o-ring goes in the assembly because there did not appear to be an o-ring when I opened up the old solenoid. I tried to find a diagram online, but no luck. Bauer won't be open until Tuesday, but my business is almost at a standstill without being able to fill tanks. Any help would be much appreciated.