I called a glass company to put a side window in a Cat hoe, and they used those to handle the rubber strip.
I asked to see the tool, and they held them up for me but wouldn't let me touch them. I said "great idea using cotter pin pullers", company owner said "no, this is a Glaziers Gooseneck Tool, you have to order them from the glass company for $55 each. I issue one to each employee, if they lose it they have to buy it."
I told him Sears sold them for $5 each as cotter pin pullers. he didn't believe me, so I got mine and they were identical, right down to the handle shape, except mine had Craftsman on it. I told him he could have mine so he could have a spare, but he said, no he was going to stop by Sears on the way to the shop and order 10 of them.