I have an old Mirro 16qt (the 0406 model) thats as old as I am. It worked fine last time I used it, this time it won't hold a seal, which means its not holding pressure properly, and I have no clue why. I tried oiling the seal, replacing the seal, oiling the replacement seal..... I know we don't have a ton of canners on here..... I tried contacting the company that owns Mirro, and they said that if I'd replaced the seal then there wasn't anything else to be tried, but they DID send me a mail in rebate for use on a replacement purchase of one of their canners. I thought that was cool, and settled in to look.....the old canner uses a weight to maintain pressure, it jiggles as it releases steam to keep the pressure from going to high. When its jiggling at a rate of 3 or so times a minute its holding pressure properly, though the noise of the jiggling can be annoying it has the benefit of allowing me to listen to it anywhere in the house and be sure that the canner is maintaining properly......the new Mirro canners don't jiggle, instead they just "puff" steam 3 times a minute when at pressure.....you can't listen for a "puff", at least not in my house. Arg. The more I look the more it looks like I don't have an option, its a choice Mirro's puffing weight (less than $100, Presto's dial gauge (which also requires constant checking, less than $100), or spending $200 on an All American canner with both a jiggle weight and a gauge. I'm less than thrilled about this to put it mildly. I don't suppose anyone on here has a pressure canner they can recommend?