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I think I've solved my problem. I bought some pipe insulation. It's foam used to wrap water pipes in cold areas. It's also dirt cheap. It comes in varying lengths and the stuff I got has a 3/4" inside diameter. It is also slit lengthwise allowing easy removal later. I simply cut it to length, poured in the modelling plaster and let nature take its course. One hint, run a piece of tape around the insulation so it doesn't spread open as you put the plaster in. It leaves a pebbly surface much like I had hoped for, making my bridge piers look rough-cast.
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