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One of the reasons why there are height differences between the corner units and the regular units on the Pisa systems is because they are manufactured at different times.
The fact that the industry tolerance for dimensional variation is +/- 1/8" doesn't help either. 1/8" + 1/8" = 1/4" tolerance. It's ridiculous. I was a landscaper for a few years in Montreal and had some great experiences with the Techo-Bloc products. Their tolerance is stricter than the industry's being +/- 1/16". Also, all of the sizes are manufactured at the same time and always bundled together. All units are tapered and corner units (1 left and 1 right) are found on every layer of every pallet. If you don't need them, they integrate right into the wall without a problem.
Additionally, they make their pavers, walls, slabs, edgings and masonry all on the same machines at the same plant so colours are the same and consistent. It's a great product.
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