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I could of course mask the head tube interface, and inner surface of the cup so to only attack the outer surface of the cups that don't touch anything else than air...?
Grease would theoretically work right?I've developed a working method with caustic soda of using thick drain cleaner fluid so higher viscosity, enhanced by the small pellets of caustic soda leading to even higher viscosity and potency.
Please shoot me down if still stupid. Although you generally don't need encouragement for that..;)
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I could of course mask the head tube interface, and inner surface of the cup so to only attack the outer surface of the cups that don't touch anything else than air...?
Grease would theoretically work right?Masking solves your erosion problem, grease doesn't solve your masking problem. Sodium hydroxide turns grease into soap. Powder coat masking tape should work, you might get some bleed at the edges but not enough to affect the fit.
The anodising is easily thick enough to push you out of tolerance, and that's assuming you only take off the anodising. Sodium hydroxide dissolves aluminium better than it does aluminium oxide, so you're likely to remove base metal too.