For those of your engaging on your own repairs, here’s some places to get the tools and bits you need. This list is purely alphabetical; I put an asterisk next to those I’ve gotten parts or tools from, which you may take as an endorsement; I’ve yet to feel I’ve been ill-treated in any of these transactions. Lack of a * just means I haven’t tried them out yet.
Anderson Pens* (they have taken over for Martin’s Pens* as suppliers of the reproduction Snorkel point seals)
The Classic Nib (more in the line of components for modern pen turners than replacements for vintage)