I needed not to be down more than a couple of hours, so instead of pulling and _hoping_ my old compressor pump was in good enough condition to rebuild, I bought a 2-stage pump from Eaton "Polar" compressors.
My reactions, so far: They had great pre-sale customer service. The pump was shipped immediately, and I received it in Florida from Ohio four days after the transaction.
It's a beefy unit, fully warranted by them out of Ohio. Chinese built, but guaranteed against parts failure except for (basically) lack of lubrication for five years.
It arrived undamaged from shipping, but there were a few discrepancies like a leaky sight glass and mis-matched documentation. It came with only semi-plumbed head unloaders, and no information about them... not even on the exploded parts diagrams.
I contacted them by email, and asked for the correct docs by email. I got a return email saying to call them Thursday. Damn! I wanted to have it up and working Thursday morning when we opened the machine shop.
So far, the pump looks pretty nice, but we'll see how the rest goes. It's not going quite how I'd have liked the transaction to have gone.
LLoyd