Originally Posted by spinksy

hi jeff, thank you for your question,because the cones point downwards and in two rows around the circumference of the rim plate, it gives a minute surface area for snails to tack onto. to get a hold onto the cones, upside down, they would have to excert their underside over the points of the cones, causing injury, that is if they can tack onto them. in my tests, snails give up after attempting to pass over the first row of cones. the rows of cones are only a few millimeters apart, so its virtually impossible for the snails to pass over the upside down ring. i hope this answers your question. feel free to ask me anything else.. regards spinksy