Ted: Yes, that thin flange gets chipped of over the years. I always bang or thump against hardest floor though not that stroungly as it sounded above. My Paterson tank lasted a few years, but the broken one is the same kind and make as what's sold today, not what was sold decades ago :-) I already padded the bottom with putty epoxy so I expect this one to last longer. I also sealed at the top red ring.(posted 8179 days ago)Kodak's 100' bulk 35mm film can fits rather well to cover the bottom of the tank. I might even glue that on the bottom for extra protection :-)
Thanks everyone.