30 years or more old Kung Fu movie

This is a movie I watched endlessly as a kid.

There is a diamond in it that when attached to a machine makes you 10 times stronger. I’m not sure of the language but is probably a Hong Kong movie.

There is a bald guy in it who also has a small son who is bald. In the end the bald guy gets very powerful because of the diamond attached to the machine and he starts attacking everyone.

Very odd desciption but that is what I remember. I would love to watch it again. Thanks everybody.

Got something to say?