Indus motors are cheap idiots then, The factory manual would show nuts below (just due to the fact that there is glass above the screws)
The easiest way would be to lock the screw with 2 nuts and unscrew it, once you are near to removing the whole thing, unlock the nuts and unscrew the rest by hand.
Or if that is too busy for you - try unscrewing them with a 10mm spanner - they look like 10mm heads in the picture.