Okay......
This is the best one Ive heard done......but, be warned......Ive never done it myself yet. However, to me, it sounds like the most feasable and least dangerous of the other methods poeple come up with.
What you apparently do, is gently bake two turntable platters in the oven so they are warm - but not hot - then, very very carefully put one back on a turntable without the slipmat, get your record, and carefully place it on the platter - your record should, in theory, sit on the "rim" around the edge near the strobe blips, as the rest should be 'recessed' to the central hole for where the slipmat would usually sit.
This means youre only applying pressure and heat to the 'run in' of the record. Then, get the second platter off your other deck, and place that upside down on the spindle (if you can) so that likewise the 'edge ring' sits on the a-side 'run in'.
Place some books, evenly apllied wieght and position on the sandwich, and leave for a while.
Obviously, before you do it, check you can pull your platters off, and that your platter has that ridge around the edge, and that one will go on far enough upside down on the spindle..... be prepared. Also, I recommend you try it on a lesser important tune and nothing ultra ultra rare!!!!.
I will not be liable for what happens!. However, Ive always been very dubious of the whole 'glass plate sandwich in the oven' or the 'hot iron' and damp tea towel method.......they would shit me up too much about damaging the actual grooves or making it into a bloody fruit bowl.
Obviously, its intended to work for those vinyls which are 'wavy' at the edges and nearly make your needle "take off", and should just relax it enough to prevent your needle going airborne/jumping.
If I had a cheap record that was warped in that way, I would try it, but all mine are warped like the grooves are egg shaped making the needle weave from left to right, not up and down.
Its upto you at the end of the day!
Sirius