I have replaced my sink and am reinstalling the disposal. I have the upper mounting ring in place in the sink hole and secured properly. I placed the thick rubber gasket you see from through the sink hole onto the top of the disposal. I hold the disposal against the mounting assembly so that the mounting ears fit near the openings in the assembly, but for some reason the rubber gasket will not compress enough to allow lower disposal mounting ring to align high enough to the upper ring. It is approximately an 1/8" too low. I actually used a jack to try to compress it up, but this only pushes the cabinet base down and does not compress the gasket at all. I am going CRAZY, since this seems SO simple.