This is the 10mm nut that secures the flywheel to the crankshaft, may become damaged when removed with the incorrect spanners.
Make sure you replace this item if in any doubt as extensive damage can be caused if it fails in service.
Suits ATC70 73-85
Also suits C70M 70-71, CA100 61-62, CA110 62-69, CL70 69-73.
