Let me start by saying I am homeowner installing this wall myself. I purcased 1400 sq ft of Anchor Highland Stone from Pavestone through Hardscapes a local dealer close to my home in southern Indiana. The wall consists of three different size block,a (6x6x12) (6x12x12) (6x18x12).The 6x6 and 6x18 blocks are all running about 1/32nd under the 6'' dimension.The 6x12 blocks are all over the place. Most about 1/32nd oversize, but some as much an 1/8th'' causing me major problems. I called and visited the local dealer,asking them to look at the blocks.They told me it was Pavestones problem and I should call Pavestone myself. Hardscapes has never come to look at the block or called to see if my problem had been resolved,they have pretty much left me hanging. When I called Pavestone they said they would take back any block over 1/16th on the 6'' dimension or i could use a roof shingle to shim the shorter blocks. I could not get Pavestone to understand that if the 6x18 blocks were 1/32nd undersize and the 6x12 blocks were for the most part 1/32nd or more oversize,this would account for 1/16th''.They said only blocks that were 1/16th oversize. These blocks were expensive am I asking to much that they be on size. I have several questions. (1) Is this normal for blocks to vary this much? (2) Do pros use roof shingles to shim blocks? (3) Shouldn't my local dealer be helping with this problem? (4) What do the pros do in this situation? Any advice on this matter would be greatly appreciated. Thank you.