I don't think he rebuilds them. Yes he puts them back together but I don't think your getting a new rebuild kit for the price he charges. I think he just makes sure they are in good condition. I could be wrong, he'd be the one to ask.
He checks/replaces the commonly worn part...which is the pistons and seals.
Quote:
Originally Posted by mike@thepowdercoater.com
I don't unbolt the two halves, but I do take the pistons and seals out and then reinstall them. If you ever have a problem with them, I will fix them for you.