Cheney Reproducer Needle Arm Balance Spring (PS3015BL-O) VV-35 150)Diameter of Hub - 1/2"Thickness

150)Diameter of Hub - 1/2"Thickness of Hub - 7/32"ID - 1/4"Diameter of Pin Hole - 0

Diameter of Friction Disc - 1 33/64"

Leather Elbow for:Early VictorBerlinerEarly ZonophoneDimensionsID of Small End ~ 3/4"ID of Large End - ~ 1 13/32"Thickness - ~7/64"Color Preference - BlackMaterial - Leather

Diameter of Small Hub: 15/64"

Inside Diameter: ~1/4"

Cheney Reproducer Needle Arm Balance Spring (PS3015BL-O) VV-35 150)Diameter of Hub - 1/2"ThicknessNeedle Arm Balance Spring for: 1A Nickel 1A Gold 1P Nickel 1P Gold 2P Nickel 2P Gold Dimensions Length: 3 8" Width: 5 32" (Narrow Portion) Diameter of Large End: 1 4" ID Large End: ~9 64" ID Small End: ~5 64" Thickness: 1 64" Material: Blue Spring Steel