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you could use a cyanoacrylate (superglue or krazyglue) to hold them together, or a 2 part epoxy. They also make an excelerator for these glues so it is pretty much instantly cured after you spray it...

If you figure that one out without completely changing the look of the scales defiantly post that, cause i really like the look of the scales and would really hate to see them completely reshaped.

those look awesome. How do plan on pinning the bottom? It just seems like it would be hard with the angle that the bottom of the scale is at.