Hi Bill

If the lathe turns toward you and you have a left hand thread, the bold
will unscrew itself.

Normal right hand thread thread will tighten, (with the MT we're
talking inboard) and yes like you say, the MT should be held with a
drawbar or else there might be real bad problems, as I said in my post,
I consider it not a safe thing to do.

Have fun and take care
Leo Van Der Loo