Primer cam Index Stop Switch for Dillon Precision XL650 and SL-900 Progressive Reloading Press. The switch moves to turn ON and OFF the index by passing the indexing lever on the primer feed assembly. Integrated spring ball works as clickable position capture. Use the factory screw to install. High quality upgrades and enhancements for Dillon Precision, RCBS, Hornady, Lee, Lyman and more. ... Dillon 550 Dillon Square Deal ... XL-750 & XL-650 Spent Primer Chute.