Originally Posted by
wroomwroomoops
I also have a drum brake hub which I have no idea how to open up - and it's been worryingly screetchy last time I used that bike. I might just drill a hole and then plug it with a 3D-printed cork from nylon.
I hope you're not considering lubing the drum brake. Drum brakes use friction pads, not steel-on-steel. Lubing one of those will be just as bad as contaminating a pair of disc brake pads.
Infrequently used drum brakes can screech from rust on the drum surface.