I got an old US Divers Conshelf setup worked over last year when I bought it used....labor and parts for a first and second stage, where they replaced basically everything since it hadn't been serviced in years, ran me $95. $170 for parts and labor seems excessive....for that price, you can get a cheap reg setup EVERY year, or for sure a good used one. Especially if you reuse the SPG. And I'm sure you can sell your old setup to someone for $50....yep, that would work quite nicely, really.