In article , Iain Churches
wrote:


It is much better practice to drill and tap before anodising, and then
fit plastic machine screws into these threads, to keep tjem clean.

Again, I'll support what Iain says here. The standard approach in my old
lab was to use plastic screws to 'mask' the region around holes if we
wanted those locations as electrical connections after anodising. This is
in addition to using a 'scrape' washer when the final connection is made
after anodising.

Slainte,

Jim

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