Cheap late model Black & Decker toaster got more and more reluctant to stay
down. I finally opened it up tonight and found the mechanism consists of an
electromagnet controlled by an electronic timer. Bread crumbs had collected
on top of the electromagnet and were creating a sufficient gap to prevent it
from holding the mechanism down. Cleaned it out, put it back together and
it's working well again. One out of the four screws holding the cover on was
some weird security screw, but small needle nose pliars made quick work of
that.