I see all the five star ratings, so I'm assuming I received a bad part. I can't keep the tube from spinning. I've even pushed the pin as hard as I can against the edge of the desk, tighten it down, and insert it in the vice. It's solid for a short time, then the tube spins. I even tried putting a lock washer between the nut and the body. Still loosens up. I can't recommend this.
