I'm interested in the answer. On older M's, I never re-sealed the adjustment, and never had a problem.
35mm : Leica 1A, M4, M9, R6.2, Nikon F/F2, Xpan II, Olympus OM4TI
6x6cm: Hasselblad 501CM, 203FE, SWC, Rolleiflex 2.8F, Wide
6x9cm: Fuji 690II/III, Bessa II, Super Ikonta 531/2
4x5in : Technika Master, Crown Graphic