I agree best tool to have. I bought mine before delivery of my first Model A.
I'm still amazed that some Model A owners still use these old fan blades that are known to self destruct.
Machine tapers can be grouped into self-holding and self-releasing classes. With self-holding tapers, the male and female wedge together and bind to each other to the extent that the forces of drilling can be resisted without a drawbar, and the tool will stay in the spindle when idle. It is...
pretty sure all the info given in the link is all you need to order bolts. 7/16" - 14, the 14 indicates, 14 threads per inch
1" block depth should work, the pic shows washers. just don't bottom the bolts out
both will work.
You will most likely need to buy the spark plug adapter from a vendors. Usually the ones that come with tester are to small for a Model A head spark plug hole
Was the flywheel cut? If so the pressure plate mount surface needs to be cut also. The red book gives the correct measurement height between the two surfaces.