Can I stack multiple Chuck Extensions together to create longer Chuck Extension lengths?

No, only a single BullseyeBore Chuck Extension may be used on a drill chuck at any one time, and BullseyeBore Core Chuck Extensions should NEVER be stacked on a drill chuck. Stacked BullseyeBore Chuck Extensions can lead to potentially unstable and/or unsafe rotation of both BullseyeBore Core and the Chuck Extension(s) on the drill chuck. Further, stacked BullseyeBore Chuck Extensions may also contribute to inaccurately projected alignment patterns on the worksurface.