Woo Hoo !!! Got a new 4th stage cylinder and piston assembly today from [email protected] for my DAVV SCU100. Sent $325 Oct 30th, and parts arrived via DHL today 11/5, not bad considering everything. Got the parts installed, and the compressor works like new. Went right up to 4000psi in no time.Still unknown what caused the original freeze up, but fingers crossed it don't happen again. Running Coltri ST755 oil.