With its four-wheeled design, the SS1 is the most stable of the guides I looked at. The adjustable alignment pin makes it easy to keep a blade square to the stone during clamping. The SS1 works only with stones up to 1 in. thick, but you can purchase accessory side supports ($33) to increase this capacity (according to the manufacturer, shorter side supports will be available soon for use with sandpaper on glass). On the downside, if you’re working through stones of varying thicknesses, you’ll have to reset the blade to ensure the same angle. Also, the guide does not fit over stones wider than 3 in.

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