Morris Minor Owners Club

I have a 1968 2 door saloon and am having a problem with the front nearside brake binding. The shoes are virtually new, and the cylinders have recently been replaced. The adjusters are set to minimum. When the footbrake is applied the brakes do not seem to release properly unless I tap the drum with a hammer. The car drives in a straight line and pulls up straight. I have noticed that the drum is getting very hot when I go for a drive. I have cleaned everything off but cant understand why they are not releasing properly. Any ideas?

Weak return spring?

Likely need some pics, to see what has been set wrong?

Flexible hose deteriorating and acting like a valve?
Return springs assembled incorrectly?
Wrong size adjusters fitted at some point in the past?
Drum excessively worn so that the shoe sticks in a groove?
I think that the 3rd and 4th suggestions are unlikely, but just covering all possibilities.
As above, a photo of the assembled brakes with the drum off could help.

Many thanks for your helpful advice. I have cured the problem by replacing a sticking wheel cylinder and fitting new return springs. Just been on a lomg drive and the wheel was cool when I returned.