No32 Mk3 locking rings

[Merlin266]

Hi
Excuse the obligatory "this May have already been covered" comment, bit I'm having trouble with my locking collars to enable lead screw adjustment. I've used Peters book for reference, but the I can't undo the bstrds. When I try, I can't physically hold the drum tight enough to stop it turning while trying to loosen the locking ring, I'm not keen on letting the drum hit it's stop then try to undo it for fear of making a right balls up. Anyone got any ideas

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