OK, I admit defeat.

Her Braun oral b battery operated tooth brush.

How do you change the head?

You just pull, she said. Where's the manual, I said. I have to go, she
said and went!

I have applied the normal amounts of push, pull, poke, twist etc.
without any encouraging movement. There is a fair amount of paste
cemented here and there. What is the proper technique?

regards
--
Tim Lamb