MX125 Clutch Holding Tool

This very handy holding tool opens to 125mm and features both shaped jaws to fit clutch drums and on the reverse side of the arms two 8mm pins to allow it to be used to grip sprockets, rotors, flywheels etc.  As most attempts to undo clutch nuts without the correct tools usually causes expensive damage is it worth the risk? Suits:

MX125 1974-1976