Whether it be electronics, automobiles or medical equipment, the manufacturers should not be able to horde “oem” parts, render your stuff useless if you repair it with aftermarket parts, or hide schematics of their products.
Summary video by Marques Brownlee
Great channel covering and advocating right to repair, Lewis Rossman
Basic blender went bad (motor ran but spindle wasn't rotating). I wanted to disassemble to see if it could be repaired. Three of the four screws were Phillips head. I had to cut the casing open in order to discover why I couldn't unscrew the fourth. It was a slotted spanner.
I just pull the hair directly off the roller as is. No need to take it out. I clean it often enough that it would take more time to take it off no matter what screws it has. The worst part imo is the internal screws being phillips. Torx (whether "security" versions or not) > Phillips/Flathead.
Pro-tip: cut the hair along the roller with a knife. Don't have to unwind it more than a single turn this way.