Wooden pivot blocks wear out and cause problems with all of the balls dropping.  We eliminated the wear by machining this piece from Ultra-High-Molecular-Weight plastic.  It just refuses to wear out.  Countersunk holes for flat-head screws (included).  

Our unbreakable pivot block solves the problem of slop in the hinge bar and will last for years.

• Machined from UHMW
• Two piece block with screws included
• Refuses to wear out!