[GB SISSON]

One of my flathead rebuild books has a diagram showing a plank with 3 blocks of wood attached to a perhaps 1" plank. The 3 blocks are cut into a 'vee' shape at each journal. Not being any kind of metalurgist or real mechanic, but a career woodworker, I thought nobody could build that accurately enough to make it support evenly. Even if it was originally built by a professional woodworker with extreme precision on jigs and fixtures, the blocks would shrink and swell at different rates and with the 'vee' design, shrinkage or swelling would raise or lower the support on the journal at the whim of the atmospheric conditions. Three steel tabs welded to an I beam might work if you ground the center one and used a feeler gauge when checking the center one but....zzzzzzzzzzzzz why?