V-brake setting gauges
thingiverse
Easy-to-use blocks that allow quick adjustments to your bike's V-brake toe-in angle and tangent. They work best with 700c (622 mm) wheels, which fit snugly into the block. Simply place it between the brake pad and rim, squeeze your brake lever firmly, and secure it with a bolt. Despite some uncertainty about optimal angles, they seem to function well enough for my needs.
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