Standard .25 inch wrench used to tighten the head on a Stelling banjo. The head is tightened by adjusting 24 hooks and nuts installed around the rim of the banjo and hooked onto a metal tension band that holds the head in place. Tightening the nuts on the hooks squeezes the tension band and this in turn tightens the banjo head. Stelling Banjo Works, Ltd is located in Heards, Virginia and is owned and operated by Geoff Stelling.