You want to hold the magazine tube the same way you hold it in your hand.
Cut some pine blocks about 4x4 inches and drill a hole in the center of each one the same size as the magazine tube, you want each block a slip fit on the magazine tube.
Then cut a slot (with the grain) from one side into each block, the slot will allow each block to tighten on to the magazine tube.
Slide the bolcks (4-5) on to the magazine tube, close to the reciever, with the slots aligned and tighten in a vise. The whole inside surface of each block will be holding the magazine tube.
This arrangement will hold the tube and allow you to turn the reciever off of the tube.
Using a strap wrench is a sure way of denting the magazine tube with too much force.
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