Need some advice on flatening wrapped records.

Hey all,

I remember reading something a while back about someone who had 2 record cover sized panes of glass or mirrors or something similar that he placed a warped record between.

He then put the vinyl sandwich in the oven at a certain temperature for a certain length of time and out popped a
flat, tasty disc waiting to be enjoyed.

I'll be damned if I'm going to pay some ridiculous price for some LP flattening machine, so I'd be interested in trying this out as it seems like it would work. The only problem is I don't know for how long to stick it in the oven for or at what temp. I would imagine that it would be at one of the ovens lower settings, otherwise I'd have melted Mozart all over the place!

I was going to go to a glass shop and have them make me two panes of glass that would be heavy enough to keep the LP flat but before I did I wanted to know if any of you have done this type of thing before and how to do it. Of course, I would test it out on a record I wasn't to concerned about before I did it on anything of value to me.

Thanks.