Whenever my Spyder starts chopping, this is the first part I look at. It seems even a hairline crack in the raised plastic around the ball will create chops. Install one of these for trouble free feeding and keep a few extras around just in case. There is no such a thing as too many extra parts in your parts inventory. These detents have a flat back and are matched for the flat sided body style Spyder's.

This is a replacement for Kingman part #2304 in your manual.