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heres a link to a thread i just made about making scales.
http://straightrazorpalace.com/workshop/126136-horn-scale-making-tutorial.html

The problem with flattening the blanks before shaping is...

You can heat them in boiling water the press them between two hard, flat surfaces. It's pretty common for horn blanks to come warped. I usually flatten one side on each blank by sanding. Tape those...