Hj - wrong analogy. Heading up a stock is not at all like fitting a recoil pad. The recoil pad requires match to the stock surface contour. The stock heading requires fitting of wood to metal in unseen areas that show up only as a joint line. A wide or uneven line indicates less than perfect work. Bringing the surface of the wood to the surface of the metal is a different issue and is the one where the butt pad has some analogy.