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.
Honestly, if you don’t have a set of security bits I would be concerned about you opening up a blender.
honestly i’d be concerned about somebody without tools opening a blender. Why are they in there? How did they get in it? And what did the blender do to them?