You can find a good deal of info, including some from people who have actually tried various techniques, at Audio Asylum. Record dewarping is a very tricky business and one is better off trying things out on junk records to start with.
If I had any warped treasures, I would join a local audio club, then propose we undertake a fundraising campaign for a Record Flatter.
If I had any warped treasures, I would join a local audio club, then propose we undertake a fundraising campaign for a Record Flatter.