The WM80 repair kit, a two-piece set, a black rubber metering diaphragm, rectangular flange with six holes and a metal center plate of five holes around a pin, plus a dark gray square carburetor gasket, large center hole and six bolt holes, the diaphragm for the fuel path, the gasket for the seal, both swapped in one teardown. For the WM80 compactor family, with the BS600 and BS650 checked against the old parts. Covers why these two, what each piece looks like, how to fit both at once, and when not to tear down at all.