I have a Sheldon XL-56 and would like to get a center for the headstock. It has a 1-3/8" bore and based on my measurements I thought it would be a 5MT. I've read here and elsewhere that there may have been a bushing (that I don't have) that would accept a MT or that the spindle taper is LOO? My searches do not find LOO tapers so I'm at a loss--as usual. Any help educating me would be appreciated.