This page may help in rebuilding your dizzy: http://web.archive.o...0/Dizzy_FAQ.htm
Go down to "Disassembly" and there is a link over to another rebuild page.
"The screw that attaches the vacuum canister actuating rod only threads into the moveable advance plate, the special screw has a unthreaded end just sticks into the hole of the actuating rod." is important if you swap your vacuum advance. It was just dumb luck I noticed this special screw when I change my advance canister.