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I am in the process of removing the brake drum and cover on the speedo drive side off the rear hub of my P11

The top photo in Ron L's post shows the bearing adjuster closest the camera with the two cutouts that fit into the speedo drive

The thinner lock ring on the bearing adjuster thread with four "square" cut outs at 12, 3, 6 and 9 o'clock sits on the

bearing adjuster thread up against the hub cover. And presumably holds the cover in place?

I believe the lock ring has a left hand thread ?

I believe I neeed to loosen the lock ring to unscrew the bearing adjuster to remove it and the cover?

Am I correct ?

Or what do I need to do to remove the cover to access the nuts/bolts to remove the brake drum?

Surprisingly there seems to be little information on the web regarding the rear wheel of P11's or Matchless

Thanks for any help.