Doesn't duct tape leave a bit of sticky residue on the surface? I think painters masking tape would be a better choice. They sell them in 3" wide rolls. Just a suggestion.
Started out with painters but they are not strong enough for my vise or this lights heavyweight. Duct tape is much more heavy duty and is better for the task. Duct tape will leave residue if left on for a long time but it wont be on that long since I am shipping these as soon as I am done with them.