https://www.youtube.com/watch?v=sw90klLcipw&t=486s
Bloody dangerous thing to instruct people to build. There is no earth connection on these type of appliances because they are double insulated.
This means there is no metal showing and a very limited chance of receiving an electrical shock.
This bloke has removed the nylon spacer from the shaft and replaced it with a metal chuck.
The only protection is now the thin coating of varnish on the armature wires, and hopefully, the earth leakage circuit breaker if one is installed in the house wiring.