I learned to heat bridge pins with a large Olde-style soldering iron, (slightly modified<G>), (Electronic type Soldering Guns are not adequate!), while applying epoxy to the opposite string side, from Darrell Fandrich. It's been many years since, but I use it often. Some cautions: 1: Wear a really good mask that catches fumes. 2. Only heat until you see the epoxy START to wick. Then remove the Soldering iron, (move to the next pin). I use a general, clear epoxy, such as Devcon 2-ton. With practice, there is little or no "clean-up" needed. Can be done with the strings on, once you become proficient with this method. Ron is correct, in the process of "thins, then sets up faster". With a reasonably slow cure Epoxy, the working time is about 15 minutes per "batch". (The "consistancy" will tell you when to go to a new "batch".) I mix "batches" about the size of a 50 cent piece. BTW, I use the point of round toothpicks to apply, ONE drop per pin. The main idea, is to firm the top surface around the bridge pin. Hope this helps. Best Regards, Joe Garrett, RPT, (Oregon) Been There, Didn't Like It, So I'm Here To Stay! [G}
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