1) Axle parts 2) Bobbin holders 3) Handrail components, often 4) Parts of lathes 5) Pins on record players 6) Record player parts 7) Revolving pieces 8) Thread holders 9) Turntable parts 1) Axles 
Turned, carved or otherwise vertical sections placed between the handrail and the stair tread or string. Also known as balusters.