[prestadude]

I just went through a similar trial although I had to bring in some professional help to get the tank drained and cleaned (turns out the rubber seal had been installed backwards and the valve became hopelessly jammed). Since I had everything pulled apart I also ordered the rebuild kit for the air cylinder (new O rings and special lube). I am glad I took the time to rebuild the cylinder as the lube on the inside was getting old and crusty (just like me).