Here you see me using such a tool, pulled along an aluminum yardstick.
The advantage of this tool is that the block lays flat on the yardstick and
keeps the blade at ninety degrees.
Because the block runs over the surface of the ruler its difficult to hold in
position with your other hand.
Clamping a yardstick to the work surface at each end works well and keeps your
hands away from the blade.
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