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SIDE CLAMPS for Heavy-Duty Blocks 
& Accessories

ECCENTRIC CLAMPS  -- HDA 4.

Eccentric Clamps are used to combine two longer Heavy Duty blocks together.  These clamps
 fit into holes in the sides of blocks 1 inch and larger, and accessory items.  (NOTE:  Heavy
 Duty blocks less than 1 inch thick do not have holes in their sides, and are held in combination
 either by wringing alone, or by using a Quick-Acting Clamp.)

1. BEFORE CLAMPING, THE GAGE BLOCKS MUST BE WRUNG TOGETHER .
2. DO NOT RELY ON THE FORCE OF THE CLAMP TO SQUEEZE THE BLOCKS TOGETHER.
    THIS IS UNRELIABLE AND MAY RESULT IN INACCURATE MEASUREMENTS.
3. IT IS IMPORTANT NOT TO OVER TIGHTEN THE CLAMP.  OVER TIGHTENING CAN ALTER
   THE DIMENSIONS OF THE GAGE BLOCKS.  NEVER USE MORE PRESSURE THAN IS
   COMFORTABLE WITH THE THUMB AND INDEX FINGER.

An important advantage of Heavy Duty style blocks over rectangular and square blocks is that
 the blocks may be wrung together and then secured as the combination is being built.  For
 rectangular and square blocks, the entire combination must be built before  being inserted into
 the clamp or inserting the tie rods.   This makes building long combinations with Heavy Duty
 blocks far easier.  

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GB79