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Without knowing what fixturing you have it is hard to tell you what to use----are you trying to setup to do many "A" heads, or just one----I still would try the "123" blocks under the bolt bosses and tie it down through the plug holes---sometimes I have to use feeler gauges for adjustment shims in the setup ----if you want to do many of the same heads you would make a plate with fixed jacking screws, another machine I have has clamping arms that grab the sides of the head to hold it ----the beauty of the Bridgeport is that it can be used to make it's own fixtures