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How old was your "old Sherwood"? Was that the one that's 14 years old? Up to, like, the late 1980s or early 1990s, the first-stage Sherwood pistons had a crimped-in HP seat... you indeed had to replace the whole piston when you needed a new seat, at horrifying cost.stacey_n_jamie:my old sherwood is a piston reg and to replace the piston is 60 bucks , the new one i have is only 6 bucks to replace a small piece in the piston.