MSW Motor Technics MSW-STC-150 Manual De Instrucciones página 31

c) Insert one blade leg into each hole in the mount, then tighten the nuts so that
the blade legs and the mount make full contact.
d) Improper installation will result in the blade not being heated.
BLADE INSTALLATION ON MODEL MSW-STC-150B:
a) Install the blade when the unit is unplugged and not hot.
b) Using the supplied wrench, loosen the nuts in the sledge counterclockwise.