Tappet Adjuster Screw, complete with locking nut, suitable for use on BSA models C15 & B40. O.E.M 40-0163 & 24-0563. Supplied: Singles.BSA C15 & B40 Tappet Adjuster Screw, 40-0163 / 24-0563. I104E, V138SKU: 40-0163 / 24-0563. £5.55PriceQuantityAdd to Cart