Thanks Paul and Johnny! Those were great suggestions. I tried using the teeth from a spare clipper guard to add to the length on my 1.5 inch guard. It came out a bit messy, but it should get the job done. I want to try again though. I think I am going to buy and cut up some plastic Pick up Sticks (a game played by children) and use those instead of the stirrers Paul mentioned---I would order the stirrers if I lived in the U.K. I can't find something equivalent in the U.S. without enormous shipping charges.

By the way, I am completely confused as to how the clipper guards work to achieve the lengths they say they achieve. For example, when I attach the 1.5 inch guard and then measure the distance from the end of the guard to the blade, I measure 2.5 inches. But it actually cuts to 1.5 inches. Does anyone understand how this works?

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Ohio Guy,
The Robocut and Flowbee are great, but they are noisy. Also, you can only cut up to half an inch at a time---this means it is slow in cutting 6 inch hair to 2 inches.