On Fri, Aug 29, 2014 at 1:18 PM, Dawes, Andrew M.  wrote:
> The o rings have probably been cleaned and baked, a stopper could have
> enough residual material inside it (like a sponge holding water) that it
> would outgas so much that it looks like a leak -- i.e. virtual leak. You
> could find some vacuum-friendly epoxy (vacseal) and fill a narrow hole in a
> flange but everyone I know who tried to roll their own UHV parts gave up or
> regretted it. It's so picky that there is a reason stuff is expensive.
> Surplus is a great option as long as you can get the parts super clean.
>

Hmm, makes sense. I've seen that epoxy somewhere, though the FIB
operator had a bad experience with epoxy fouling his system (probably
didn't use the 100% solids epoxy, and maybe didn't degas before it
set)... so I'd have to sneak the epoxy in if I wanted (I was thinking
of potting the electronics, if needed).

Thanks for the opinions, they're definitely valuable!
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