(slang) a doubly sure or doubly easy thing. Leadpipe refers to a midwestern and western US form of galvanized ironpipe (which looks as if it were lead). For saddling and cinching (fixing a saddle securely) the sort of horse that expands its belly, a short length of this so-called leadpipe was slipped under the saddle strap and turned like a tourniquet, the work assisted by a few knee jabs in the belly. Thus the horse was forced to deflate and the saddle was cinched tight, that horse now being double (lead-pipe) cinched. —SHSBC Binder 22 Approved Glossary