Thats funny.lol I have "boiled" mine in the past with good success. I figured 212 degrees is just enough to stretch it a thou and get it on a little easier. Not as radical as 300 in an oven.lol
The easier and safer way to do it is to just rest a 100 watt lightbulb or flood light on the snout of the balancer. In 15 minutes or so it will be plenty warm without risking ruining the damper.