National Hardware V7601 1-7/8-Inch Roller 4-3/8-Inch Stem 7/16-Inch Shaft Standard Rollers, Plain Steel Garage Door Rollers (2-Pack) have a stem diameter of 7/16 in. and are 4-3/8 in. long.
Plans to build the Beamer Stirling Cycle Beam Engine Beamer represents a large Victorian style beam engine that could have existed in the mid to late 1800's. It is a unique design and nothing like it has ever been done before. A belt driven cooling fan allows the engine to operate continuously at a temperature only slightly above ambient!
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