If that's not it and you've got a friend working at a hospital, see if they can sneak it in and put it under an x-ray machine for you. That might be enlightening.
looks like there are 4 machine bolts holding the handle assembly to the main body, if you remove those 4 bolts the handle will split allowing you to access to the switch.
Handle is two indpendent sides, with a longitudinal-vertical split (that much is obvious), which snap together clipping onto the end of the motor housing. The thing about this snap-together fit is that there is a circular feature with grooves and flanges cast into the plastic, and corresponding couterpart feature in handle moldings, which make the handle clip on quite firmly without any screws. Then there are a couple of protruding pegs in the handle moldings which fit into corresponding recesses in the motor-body, at the 3-o'clock and
9-o'clock positions. So the set-up is very rigid before you even put the screws in.
Hence, couldn't work out what was going on... Thanks for the helpful suggestions. The X-ray one is "class", while the "check there's no screws hidden under the labels" was said to be a very good one, particularly regarding things made in Japan.
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