I'm re-gluing a loose magnet inside a Shimano DH-3N20 dynamo hub and having trouble removing magnetic debris. It's in the form of fine powder, mostly rust particles. They're too fine to pick out, but there's enough to potentially interfere with getting the magnet seated so it clears the armature.
I've tried using masking tape to "tack up" the particles, but it's not very effective and won't reach into crevices. I don't have a source of compressed air but am unsure it'd do more that push the rubbish around.
Has anybody found a solution to this sort of problem? One thought is something like Plasti-Dip (tool handle coating), but it has the potential to make an even bigger mess if it won't peel off clean.
Thanks for reading,
bob prohaska