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Ever try to get a mason to lay a few blocks on short notice? Maybe you ended up doing the job yourself, taking three times as long and getting less-than-professional results. If that's the case, then check out the Block Laying Tab. The people who make it claim that the Tab lets even unskilled laborers quickly build level and plumb concrete block walls. The Tab is a 20-gauge galvanized steel spacer that automatically maintains 3/8-inch vertical and horizontal joints between blocks. Although the first course must be carefully levelled, the Tabs do the work after that. Before the mud is spread for each course, the Tabs are inserted into the top of the preceeding course so that each tab