Why not look at a used dry mount press for flatting prints. It would be considerably less expensive. I haven't tried it myself but it's worth looking into.
A dry press won't work - the vinyl has far too much 'memory' and will go back to orignal shape as soon as the record is removed from press. I tried ! I also tried with two panes of glass sandwiching the LP and running under very hot water from tap - not hot enough. I have not yet tried the oven yet with the glass sandwich as suggested in an LP forum but this will need experimentation not to de-form the vinyl too much....
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.
I have one of these Record Flatteners which I bought in Japan on one of my trips there. It is the same as tyhge model as sold by Air Tight in the US.
I can tell you that it works beautifully. In order top flatten a record you need controlled and even heating which is exactly what this provides. I give this machine two thumbs up. There were some that mentioned degradation of the sound when the record was flattened but I have not experienced this.
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