Gipsy Major 10-1-1 propeller hub removal tool

[Terry Lee]

This is a bit of a long shot I suspect, but, I have an engineer friend who would be able to make a puller/extractor for removing the the prop hub from my 10-1-1. This was done once before using the correct tool for the job, unfortunately the latter has been lost. below is a link to a 'laser' tool which is illustrative of the one used
http://www.lasertools.co.uk/item.aspx?cat=931&item=8055

Question is, doe's anyone know what the TPI and pitch is on the internal thread of the hub, which the tool screws into (external thread on the tool) and the diameter?

Any help would be most welcome.