PB 3400748 Hand Knob for Minuteman Power Boss Sweepers and Scrubbers. A cast aluminum 4-prong knob with steel 1/2-13 threads. Fits Minuteman Power Boss models: Core 50, Armadillo 9X (9X, 9XCE, 9XR, 9XR Europe, 9XV) , Monitor Series (82, 90), Commander Series (C82, C90, T82, T90),and others. Commonly used as a main broom idler cover knob. Please refer to your parts catalog for the proper application. Priced Each. Replaces Minuteman Power Boss 3400748. Our Part Number PB 3400748