Chris,
Show him the relevant section of the workshop manual. If you don’t have a copy it can be accessed here ….
https://traction-owners.co.uk/technical-library/
Please make him aware that, for his own safety as well as that of the car, it is imperative he uses the correct hub-puller as illustrated in the manual. This puller is in each of the tool kits held by many of the area Sections and available for hire to members – see the Sections page in FP.
B…..