A replacement spindle, designed for the MK 2 style of keypad and ECP models of the BL3430.
To determine if you have a MK2 model, this is determined by the back of the keypad. If the spindle follower is flush with the rest of the chamber, it’s a MK2. Anything extended past the chamber is a MK1.
This is designed to work on the BL3430 models only.