Store › Springfield Spring-Lock Replacement End Cap [2100012] Springfield Spring-Lock Replacement End Cap [2100012] $16.99 Spring-Lock™ Replacement End CapReplacement Spring-Lock™ end cap for securing the locking latch in the post. Add To Cart Added! Spring-Lock™ Replacement End CapReplacement Spring-Lock™ end cap for securing the locking latch in the post.