[Lynn Eades]

Hi Arie, Have you wound the adjuster back off?
You can also disconnect the pull rod (remove a clevis pin) and push the rod back into the bisector. It might help to do this first, then adjust the brakes up tight, and then back the adjusters right off.
Your drum might be worn with a shoulder (ridge) that the brake linings will not pass.
Maybe turning the drum as you pull it will help.
If every thing else fails try undoing the bolts and nuts that hold the adjuster assembly and the bisector (actuator) assembly and carefully tap them in as you pull the drum off.
Be careful. The drum and hub assembly is heavy.
Let us know how you go.