Glenn,
I have a 404 with the same front Lockheed 12 x 2-1/4 inch alloy drums.
If the brakes were OK before, but now BOTH front drums are dragging simultaneously, it could be a hydraulic problem - and logically there are only 3 reasons for this i.e. sticking slave cylinders, a faulty master cylinder, or blocked pipes.
(1) You have just serviced the slave wheel cylinders.
(2) If your m/c is single chamber (and not tandem/dual chamber) - one would expect the back drums to be affected as well, if it is faulty, if not.....
(3) it leaves only the front brake pipes - more likely in the rigid pipe section, unless BOTH flexible pipes are coincidentally blocked!!
I have never had the front brakes drag, and there is no provision for manual adjustment as you say.
vincent
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