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PJM20, my daughter was in high school and had to do a science project.  I was flabbergasted when she built a rolling Schertzer bridge from a picture in one of my model railroad books.  Good Luck on your bridge. Heard a little saying about those that criticize, and I notice the resident criticizer in 'on' your case.  His posts don't add much to other forums either.    Those that do, do.    Those that can't, teach.    Those that can neither do nor teach, criticize.  I expect you will do just fine if you pay more heed to those that can do or can teach and ignore the others Art.
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