Just in case anyone is interested. I got ahold of DIP to find out the measurements of their smooth universal bolt knob as it wasn't listed. It is 1-1/2" long and 1" dia at the end. I also found another smallish bolt knob. It is Anderson extended tactical knurled aluminum bolt knob by PT&G. You just have to cut off the extended part as it is tapped for 5/16" instead of 1/4". Then drill and tap to match threads you put on your bolt. It measures 1-3/16" long after cutting and 3/4" dia. Will be shorter and right between the two DIP universal knob diameters.
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