biases the lateral pin 20 against the gauging elements 10 in a preferred embodiment the lateral pin 20 is made of a soft metal such as brass so that when urged by the securing bolt 38 the lateral pin 20 deforms slightly and compresses within channels 79 of individual gauge elements 10 as a result of the clamp the lateral pin 20 is held in place preventing lateral movement of the pin 20 into or out of the block 15 due to differences in the width of the proximal ends 75 and channels 79 of the various gauge elements 10 varying amounts of pressure are required along the length of pin 20 to sufficiently compress and restrain the gauge elements in a fixed position thus a preferred construction divides the pin 20 into segments to prevent the necessity of compressing a single pin 20 into all the gauge elements 10 this method of securing gauging elements to a block may also be employed for double gauge modular blocks 130 as seen in fig1 a rear and forward gauging elements 11 and 12 are arranged in parallel transverse rows on block 130 the rear row of gauging elements 11 is held in.