Warped records, can they be somewhat dewarped?

Whenever I tried it just made the warp worse.

I have a Sony turntable with "Biotracer" (servo controlled) arm. It does handle badly warped records that I could not play on other turntables.

A record clamp can help with many warps. One of the newer perimeter clamps can help with what's left. Between those two clamping systems, they will iron out nearly any warp that is under consideration for being played. The perimeter clamps are not cheap, some costing about $500.

There's a guy on AA who offers a periphery clamp custom made to fit your platter. I don't know his costs or details, but here's a link:

http://www.audioasylum.com/audio/vinyl/messages/199121.html

Some people I have read about put the record (leave inside the jacket) between two flat heavy objects, such as books and leave them there for a month or so. Others take this a step further and put them in an oven on the lowest possible temperature. I think that may be risky for a number of reasons. Of course you should try this on records you don't care that much about at first. I've tried the books without oven and it seems to help a little. I am thinking about trying this, but put them in my attic which is warm, but will not get near flammable temperatures. Also what this does to the grooves may not be good for the sound. Try this at your own risk. I will accept no responsibility in this area, only something to think about. :')