Here is some information on how our modular adjustable gauge looms work.  Please visit the tutorials page for more information and other great downloads.  On the modular looms the pin board will always have the smaller edge closest to the pegs.

Look at the 2 pieces, and you will see one board has pegs, the ones with the inverted u shape; the other board has pins, or rods. The pins and pegs are not on the center of the boards.  By assembling the boards facing a different way we will obtain 2 basic gauges.
 

If we assemble it, with the 2 sides with the smallest edges facing each other, we obtain gauge 1:
This gauge works great with light weight yarns.

By assembling the larger peg edge against the smaller pin edge we obtain the second setting:
Gauge 2 works good with medium weight yarn, like Red Heart medium.

Adding washers between the 2 boards, on any one of the settings, will give another gauge.

 So, get your yarn, play around and find the gauge that suits your needs.