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.
If you haven’t already, look into getting a ratcheting screwdriver with replaceable bits, and a pack of various bits for it. Idk where I got it, but I’ve got all kinds of screwy bits (including the H-bit head) that I need very infrequently, but I’m always happy when I do and I already have it.
I think the bit pack I got was for the security torx and it came with a bunch of other stuff.