Originally Posted by JohnDThompson

Some Lambert/Viscount cranks were threaded 7/8" x 24tpi -- good luck finding an extractor for that! It's possible the spindle threads were also some obscure spec. Unless you're trying to keep the bike authentic, the most expeditious solution is probably to replace the cranks and bottom bracket with more standard parts. The YST threadless cartridge does not have a good reputation for reliability or longevity, but it may be adequate for your purposes. Velo-Orange also offers a threadless cartridge that has been well-received. Another option is to ream and tap the shell for Italian thread cups, which is what I did with my Viscount.