A helpful hint for that kind of problem. Take your regular or shop vac, put some old pantyhose or cheesecloth over the end of the hose and then slide the extension tube on. Poke around for the lost item and then sort through the junk collected in the pantyhose. If you have too much crud under the bench, you may have to clear out the tube a couple times, but it does keep you from having to dig through the entire canister.