I got two of these for a jackshaft, but upon recieving them, the bearing inside of them does not actually spin. I put a 5/8 jackshaft into it, and the shaft just slid in the ID of the pillow block bearing without actually spinning it. Using my fingers, I cannot get the bearing to even budge. I am quite confused, does this not come with a bearing? Is this just the housing that holds a bearing? hmm...