I have a Macallister 1700w rotary mower (mac1700rma) heard a bang from inside. When i stopped the mower as the blade stopped the mower made a screaching sound opening up the motor compartment i found broken bits of what looked like the disk used in cley pigeon shooting but when the bits are put together there is a square hole in the middle. The mower works but makes this screaching sound when the blade and motor are slowing down to stop. Blade and belt are fine.

Trevor, March 2011