Leading A-Series engine specialist since 1981
Here's the most secure method of holding the crankshaft in place to remove the flywheel or damper bolt. This sturdy locking tool bolts in place of the Mini starter motor and securely holds the flywheel by the ring gear.
Some use old bearing shells or flat blade screwdrivers to attempt the job, leading to many grazed knuckles and much damage!
A good investment for any Mini DIY mechanic.