Just a pulley.
One of the things you might want to do is remove your pulley, inspect it, make sure the rivets are tight, then you can look at the magnetic clutch, to see if it has any damage it will have where marks on it.

To remove the pulley, take the bold title the end of the pulley using either a belt wrapped or you can break the bolt loose, sometimes with everything still hooked up, once the bolt is loose( loose not remove), then remove your belt.

If the pulley slides off, your good now inspect everything if the pulley does not slide off take two screwdrivers and tap,,,,, I said tap, not bang a screwdriver down a little as the pulley moves forward at one point it will get loose and come off. Don't lose the shims, count them, make sure you get the same amount going back or maybe less if the clearances to wide., If you take some real good pictures and post them, maybe myself or someone else can look at it and tell you if there's anything wrong. good luck, Jim