Tom, the only problem with your idea that I can think off right away is that a drill bit leaves a very rough hole. Maybe the Delrin would wear smooth quickly enough that that isn't a problem?? A tapered reamer would leave a smoother hole. Maybe one could make a pointed tool that could be pushed into the Delrin while hot and "melt" the hole tapered??
One thing the brass bushings do is take up the wear, especially in the Hudson and Northern tender trucks, which can wear to the point where the truck sides touch the rail, especially going through switches, causing momentary shorts. My theory as to why the tender trucks seem to wear more than others (passenger cars, crane cars, etc.) is the electrical load actually arcing in the bearing area, which removes a bit of the metal over time. Just a theory, but it's also my theory why diesel motor trucks usually need rebushing.
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