Changing the bottom bag on a dust collector—sliding then holding the slick plastic bag on an equally slick painted base, while simultaneously positioning and tightening the bag clamp—seems like a task designed for a three-handed woodworker. Rather than trying to sprout an extra limb, I bought a roll of magnetic tape, attached a few strips to my collector, and used the remaining scraps to tack the bag in place. Both hands are now free to install the clamp.