• O.D. cup to center the spring on the outside diameter
• Only recommended if you always have tension on the spring through travel
• This cup works well with the WM165BO bearing to help with spring twist friction
• Short cup (WM404SC) is 1" tall and tall cup (WM404TC) is 2" tall
• Drop cup design moves the spring table down 1" compared to the WM404SC spring cup