The video can be confusing. When the mechanism actually is released at aprox 1.20, the view is from the outside, with the drum taken off. Yours is stuck so naturally, this is not what you are going to see, but it shows how the shoes move inwards once the adjuster is released by the screwdriver inserted from the inside of the brake plate. As a said, you might hav a similar arrangement.
Completely wrong I'm afraid
A 1967 car uses brake backplates from an Austin A60. The hand brake is actuated by rods running parallel with the axle running to a bell crank arrangement which pulls the brake shoes against the brake drum. Simple way of freeing off a stuck handbrake is to remove the pin from the yoke end connecting the rod to the bell crank and then tapping the arm towards the drum.
Also the early arrangement uses a manual adjuster rather than an automatic adjuster for which you need a special brake spanner (to do the job properly otherwise mole grips
Source: years of experience rather than a You Tube mechanic
Arwyn
