had the rear drum off today to change a cylinder that was pissing all over the shoes, and when i went to put it back on half the fecking bearing just came apart from the drum and sat on the axle on its own!the lower half (is it the outer race?) is still in the drum, and i have put the top half back in, but will i get away with it like this? do i need to have it pressed back in, or is it a sign its knackered and i should get a new bearing?