Section 5 - 2Cylinder Installation GuideIdentifying the ManufacturerLogoBrand On Face NotesArrow yes "AMEROCK"' and other OEM names have been used.Corbin yes Prior to the brand merger in 1993, the individual brand names "CORBIN" orRusswin "RUSSWIN" were used. The Emhart logo, a capital E with horizontal arrowswas used during Emhart's ownership. Some older unit locks have no trademark.Falcon yes Falcon LY series grade 1 levers were imported from the samesource as PDQ grade 1 levers and are sometimes confused.LSDA yes Imported; house brand of the IDN companies.Marks yesPDQ maybe Latches for these locks bear check marks in a circle (sic),and may be private labeled.Products assembled in the U.S.A. are marked "PDQ".Sargent yes Product line numbers 6, 7, 8, 9, 10, 7600, etc. are stamped on the face.eg., a latch face marked "8" indicates an 8 Line lock.Schlage yes Same key-in-knob cylinder body used throughout cylindrical lock line.Only the tailpiece shape and orientation vary.Yale yes5-pin versus 6-pinOlder hardware may have 5-pin cylinders and no room in the handle to retrofit a 6-pin cylinder. Existing oper-ating keys can be misleading. For ex am ple, some contemporary hardware is pinned to 5-pin keys, eventhough the cylinders have six pin chambers. This is re ferred to as "drilled 6, pinned 5". Try a 6-pin key blankin the cylinder. It won't seat fully in a 5-pin cylinder.The face of the latch is the first indicator of manufacturer. Certain brands of latchbolts and lock chassis are compatible. For example, occasionally an Arrow chassiswill be seen with a Schlage latch bolt. When the knob or lever is removed, theappearance of the spindle cam, i.e., the cylindrical actuator into which the cylindertailpiece fits, can be used to identify the chassis.