Store › Springfield Spring-Lock Replacement Seat Mount Bushing [2100010] Springfield Spring-Lock Replacement Seat Mount Bushing [2100010] $15.99 Spring-Lock™ Replacement Seat Mount BushingNon-locking Spring-Lock™ seat mount replacement bushing. Add To Cart Added! Spring-Lock™ Replacement Seat Mount BushingNon-locking Spring-Lock™ seat mount replacement bushing.