This is a very easy mod to make a super long (3') clamp by using parts from smaller clamps. The little collar/pin is tapped out of the smaller clamps and the handle grips are slid off. A flat piece of stock can be had from most hardware stores for $5 or less (1/8" x 1/2"). The handle grips slide right on and can also be used as spreaders.
Thanks for taking a look.