I sell them for P:48 and call them Gauge Blocks. That won't do you much good but I also make my own for other gauges, including O Scale (Ow5) and I suppose it would work just fine for O Gauge (3R). I cut a piece of tubing, in this case brass because I had it laying around, to the correct length and then cut a slot for clearance. Shoot a piece of PVC might work. I'll try to take a photos of one of the brass ones I made. I use NMRA standards. I assume this would be correct for 3R also. Your mileage may differ. So I don't get into trouble with The Powers That Be, none of this is an offer to sell. Jay
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