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To install the Mast springs on the new heads, MM recommended the installed spring height needed to be 1.800 to 1.850-inch for proper spring load (130 pounds at 1.800-inch and 318 pounds at 1.200-inch). In order to obtain the necessary spring height, we placed different thickness (0.015, 0.030, 0.060-inch) shims and spring locators (stock and Mast) under the measuring tool. The retainer and locks were installed on the top of the tool and it was hand tightened to measure size. We needed to do this a few times until we arrived at the desired spring height.