LJ, Are you detecting lack of 'holding' or are you having to lift the handbrake a lot further up?
Sometimes all that needs doing is to adjust the 'ratchet' adjuster to the rear brake shoes in the drum. Do that first before considering any cable adjustment.
(I'm assuming that you have verified that there is sufficient brake lining left to adjust?!)
Helpful link here with videos :- adjusting rear brakes on a Spark car - Google Search
Ahh.... a muscle man obviously a three weetabix man !
Yes it is wise to consider all possibilities,
First make sure there is sufficient shoe thickness; ...... then the adjuster cam/ratchet.
Only adjust cable (if necessary) after doing the above. (the cam/ratchet may be all that's required to solve it)
Good Luck, hope this helps your fix.
ps. Dont breathe brake dust, wear a mask if you use airline to clean drums.
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