A movable sleeve shifts a locking surface to enable dual key access, resolving compatibility issues with existing single-key wafer tumbler systems.
Integrating plate tumblers with a locking element engaging specific recesses creates multiple resistance changes that obscure the unlocking position.
A locking cylinder aligns fixing recesses to engage a core pin before the locking pin moves inward.
Guiding structures at axial driver pin planes route closing plates past a blocking bar, preventing jamming while maintaining strong security engagement.
A lock re-pinning fixture employs a biasing follower bar to prevent pin ejection and simplify cylinder reassembly without specialized tools.
Mushroom-shaped driver pins with contoured annular bodies prevent pin alignment during picking or bumping attempts.
Segmented tumbler pins trap the bush in the shear line to resist percussive break-in attacks on lock cylinders.
A rekeyable lock cylinder uses a plug assembly with a carrier and locking bar to align pins for new key bitting.
Curved rack engagement surfaces increase bitting positions while maintaining component strength against size reduction trade-offs.