Another quick post sent in from a King George gardener: I used nylon cord to wrap around the top & bottom of the tree wrap. This prevented the swagging . After stapling, I then tied the fine nylon string around the band, then applied the tangle foot.

I can see how this would help.  Maybe I can tie some string around the sticky band that loosened on the trees here at the office.  Better than making a mess of the stapler. --T