In experimenting with some scales, even a hair dryer will produce enough heat to allow slight re-shaping of plastic and celluliod scales. I used one to gently heat several sets and ease them back into the shape I wanted, then rinsed with cold tap water to set where I wanted them. Another tip that helped me was to use something to maintain the proper space in the middle of the scales; a q-tip stick (cotton pulled off of one end) worked pretty good.

Just be careful if you opt for a heat gun. It may produce too much heat and will be really detremental on light-colored scales (may yellow them).

I am not any sort of expert so use at your own risk; just my personal experience!

v/r

Allen