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Pair of end caps to make your own scale axle. Use 3/8" aluminum tubing from your local hardware store to make an axle any length you need. Cut the aluminum tube 2" shorter than the desired length from bearing to bearing then epoxy one of these on each end. Mounting holes are .12" diameter with a .47" hole spacing. Uses 3/8"x3/16"x1/8" ball bearings. Use 10-24 threaded rod to make the inner axle.