I had this with a MK3 Cortina - the auto adjustment was iffy at best but almost impossible to release until the drums were off.
I used a small grinding stone on a stick in an old Wolf drill - it took forever. First car, no money and so every other weekend fixing something :(
Although I still work on the house I've have enough money to let someone else deal with the car these days.
Currently over boarding a ceiling (actually lowering the ceiling by around a foot and plaster boarding to a metal suspended frame). It's the third one I have tackled in the past few years but this one is the biggest PITA - nothing is anywhere near square, and the laser level showed that the original ceiling varied in height by around 3 inches. The 110 year old plaster on the walls slope in towards the top of the wall so any measurement for cutting the board has to be done at the level it has to be fixed.