This has worked for me. After locating a ceiling joist, drill a 3/8 hole through the plaster or drywall only to the joist. Then drill a 1/8 or 3/16 hole in the joist deep enough to take the whole thread of a 1/4" screw-eye or screw-hook. First time in and out with the screwwye or hook will require a tool to get the torque, but after that it only has to go in 8 threads or so, finger tight, when required. When out of use, no one will notice the holes in the surface, drilled oversize to prevent more obvious surface damage. Oh - and don't damage the sub!