Your father was heroic! Most food magazines recommend making the stuff by hand. And they claim it only takes about 7 minutes - yeah, right, if you’re a big oaf like Gordon Ramsey it takes 7 minutes. It takes a bloody half hour and then your arm is wrecked for life.
Homemade mayo is a b&((ch to make! That’s why I did it only once, successfully. Tasted just like Hellmann’s, so I decided to buy it instead of making my own.