Ok, I admit it, I must be stoopid
I can't find those little brass plumbing plugs used to seal the holes in waterblocks and such. I found some aluminum ones at Pep Boys, but I don't think they would like my copper block.
Know what I'm talking about? Threaded, normally has a hex Allen type head, almost flush with the surface after it's screwed in. Erg, need about 10 to fix my mistakes