Store › Springfield KingPin Taper-Lock Adapter [2100032] Springfield KingPin Taper-Lock Adapter [2100032] $40.99 KingPin™ Taper-Lock™ AdapterInserts into Taper-Lock™ base to accept KingPin™ posts or mounts. Add To Cart Added! KingPin™ Taper-Lock™ AdapterInserts into Taper-Lock™ base to accept KingPin™ posts or mounts.