Hi James
Here is a current source for cage nuts that I have used. Mac's Antique Auto Parts
http://www.parts123.com/PartFrame.as...com/&TITLE=Mac's_Antique_Auto_Parts
When you get the search page hit advanced search then type in caged nuts and it should take you to the listing.
Current cost for 1/4 20 cage nuts is $.60 US each
Cheers Phil