Many time there will be a need for a new tote bolt. Here is the remedy
Click here are f your looking for the tote repair help.
At the end of this there are links to where you can buy a 12-20 tap and die, or you can use a 12-24 and just retap the plane sole.
Cut the rod to length and thread both ends.
Cut a piece of brass rod to the right length. (7/16″ for Stanley, 13/32″ for Sargent)
drill and thread the nut. Cut the screwdriver slot.
Polish
Tap and die
http://www.victornet.com/subdepartments/Special-Pitch-Taps-up-to-1/2-inch/1260.html
http://www.victornet.com/subdepartments/Special-Pitch-Dies-up-to-1/2-inch/1350.html
St. James Bay Tool Company 12-20 Tap and Die Set.
eBay Seller Nicobie sells 12-20 Taps and Dies.
1/4-20 BSW – located on eBay from a UK merchant.
Victor Machinery Exchange 12-20 Tap
Victor Machinery Exchange 12-20 Die