whats the cone made of? how big is the crack?where is the crack? can i buy some crack from you? if its plastic. scuff it up a little with about 220grit sandpaper and use a plastic adhesive...model glue...use as little as possible and let it dry and cure for at least a day or two.for ceramic coated paper, use a good wood glue.same as for your enclosure.once again as little as possible and let it dry and cure for whatever recomended period.for anything else, duct tape! use a whole roll if you have to maybe you should screw or strap your box down.