OKay here's the cross section diagram
http://i25.photobucket.com/albums/c6...r/scalefix.jpg
color key:
Black = your scales (pivot is on the left side, wedge is on the right side)
Red = popsicle stick/paint stir stick sanded and cut down to fit very closely inside the entire length (especially the wedge end)
Blue = splint on top and bottom of your scales, this should be something sturdy like a thick metal ruler, thick wood pieces, etc.
Green = points for c-clamps or vise grips. I think these would be the best choice for a couple reasons. First, you can keep them clamped down while you steam or hot water dip the whole straightening assembly. Second, I don't think you will find a micro fastener bolt long enough to go through the five layers of materials we have stacked up.
Since we can't verify through your pictures whether they are celluloid, ivory, or faux ivory, it is important to remember to take this slow. Heat for a higher number of short periods rather than heating couple times for 20 minutes at a time.
Also, you want the clamps to be tight enough to hold your scales in the proper alignment, but no tighter. I noticed on mine that there were some spots that had been smashed down by the weight while the plastic scales were malleable. Nothing bad beyond aesthetically unpleasing but I wouldn't want to ruin the nice detail work I can see on yours.
I hope this helps.