I purchased this product with a straight edge and saw guide. A ruler with an extension and saw guide has been tried and tested to make straight and true 8-foot cuts from finished 3/4-inch plywood. The jig adjustment was tenuous at best and didn't allow for fine tuning and could become loose. There aren't many moving parts, but the ones that do are subpar, especially when they loosen mid-ridge and your groove doesn't go straight anymore, even if it's all only 1/16th.
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