Furutech / Air Tight LP Flattener - do they work?

A surprising number of new heavy audiophile pressings have severe dishing that can't be removed with a record clamp, not to mention older discs. There's another thread here that outlines the frustration of both customer and retailer regarding the difficulty getting satisfaction through returning warped LPs. The economics are primarily about what it's worth to YOU to have a convenient, safe and effective way to deal with this frustrating situation. Granted they're expensive, and granted there are cheap, if not slick, alternatives.

Incidentally, I was reading on the website for the new Blue Note reissues that RTI was having trouble with making 200 gram pressings on presses designed for 150-180 gram discs and that that was responsible for a lot of the warping problems. They do not recommend 200 gram to their clients for this reason, preferring 180 gram pressings. It seems to me that some of the problems I've observed stem from the flimsy packaging of some of the 45 reissues, where 4 discs are shrink wrapped together without a box.

Twould be nice to know a source for the Japanese generic one.

Most oven's minimum setting is about 150 which is more like what is required as long as you turn it off.

Excellent! It's just as well you had the initial experience so you have some gage of what it might require.

Both, in that the clamp and ring combo improve the sound significantly even with flat records, and, as noted above, they will not cure severe edge warps.