If you has own lathe or your friend has a lathe, you can make own 1/4-32 tap of drill rod (some time called for silver steel) or carbon steel and hardening the tap before use.

See in article about make own tap: http://easyweb.easynet.co.uk/~chrish/homepage.htm see after the list: 7. Make a tap and die from carbon steel.

I has maked 2 tap and works well as original tap.

Jens Eirik