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I install a lot of E.P. Coventry and it is a common problem as of late. The manufacturer is allowed an 1/8" tolerance, but when it is off by the full allowance it can really screw up a wall. It is especially bad with using the combination pattern. I would first call your E.P. Rep., if you don't know who they are, PM me your contact info and I can put you in touch with the right person. Have them come to your site and show them what you are working with. They may not be able to do much if the block is within tolerance, but at least they will know that the product's quality is slipping. Other then that, the only thing you can do is either start shimming or get out the cup grinder.
I have seen the problem with every manufacturer that we have used. Some are just worse then others.
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Matt
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