Sounds like the main center bearing is going bad that's why it is not wanting to spin on its own and is also making the loud noise when its spinning i.e. sounding like a jet engine firing up or metal grinding noise. The bearing is probably welded to the shaft now. I would not repair this very expensive cost around $300 to $600 to fix I would go buy a good quality used one or a new one sorry for the bad news but that's what it is I see 2 of these a week in my shop same problem but hope this helps.
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