Follower
A follower is defined in the Guild of Architectural Ironmongers publication 'Glossary of architectural hardware terms as 'The part of the lock or latch which, when turned by a spindle, operates the bolt. The square hole is usually 8x8mm to suit a standard spindle which extends from the handle to the follower. On a bathroom lock there is often a second follower to accept a spindle from a thumb turn, which controls the deadbolt. The thumb turn may have a 5x5mm hole to accept a 5mm spindle.'
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