What is "lewis hole"

Lewis \Lew"is\ (l[=u]"[i^]s), Lewisson \Lew"is*son\ (-s[u^]n), n.

1. An iron dovetailed tenon, made in sections, which can be fitted into a dovetail mortise; -- used in hoisting large stones, etc.

2. A kind of shears used in cropping woolen cloth.

   Lewis hole, a hole wider at the bottom than at the mouth, into which a lewis is fitted.
   --De Foe.