Clutch Worm Size?

[49panhead]

What is the acme thread size of the clutch worm on a 1947 Chief?
I would like to make a tool to compress the springs.

[Jack K]

I have a couple of spare worms but don't have an acme thread gauge. Make this inquiry on the Virtual Indian site (it's a yahoo group/list), I believe Michael Breeding still visits there regularly. He should know, he's made hundreds of them.