Airslave,
Got to say wasn't expecting that. Sounds like a serious manufacturing error, some foreign material disintegrated upon start-up, badly scoring cylinder wall. Has best-homepro made this right? I'm sure you sent the requested photos of damage. Hope he does well by you, if not, will be the first black mark against him in my book. Getting a donated Air Venturi Avenger must be a nice change, compared to the early compressor disappointments. In your shoes, I'd give first Yong Heng a pass on re-start, pending new part replacement. Start fresh with new one. WM