Heat-fire can wok well if the buckle is solid brass under the coating, but too often Tandy's buckles are plated zince and they will melt - ask me how I know!
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Chuck, that is one experience we share. I made some picket pins for a friend and rigged up a swivel ring on the pin. I had some clips to attach the rope, but they were too shiny. I threw them in my propane forge on low and watched them turn into a puddle of zinc before my eyes!
I remain your humble servant,
Just Dave