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Peanut-Butter Wrench
From WikiPedalia
A single-ended socket wrench with a flat handle, particularly the Campagnolo 15 mm wrench made for tightening crank fixing bolts and track nuts.
The name derives from the fact that racers on a tight budget would often have to make due with peanut-butter sandwiches while on the road, and in the absence of kitchen facilities, they would use the handle of this wrench to spread the peanut butter on their bread.
