Welcome to Jay Bee Hammermills Website - Hammermills,Grinders .The primary products of JAY BEE are hammermills and related materials . the great majority of the components incorporated in its equipment, JAY BEE either . the capability to produce replacement parts for nearly any of the equipment built.jay bee manufacturing inc 4w hammermill parts,Jay Bee 4w Split Top Hammermill Reconditioned JB 4w s/t | Jay Bee Model 4w Split Top. This mill has been fully disassembled and parts replaced where needed. Installed a Heavy . 4W Split Top. Manufacturer: Jay Bee.