Aerosol spray cans for lubricants (WD40, Brake Free, various parts cleaners, etc.) come with little spray nozzle tubes taped to the side of the can. These usually get lost as the tape collapses. I drill a hole the size of the nozzle through the side of the plastic cap and jam the tube into it. The cap will cause the spray tube to curl slightly and stick until I need to use the product again. Just pop the cap and straighten it, put it back into the spray button.