Tumbler, wax cast steel, cut for fly, tempered, tapped 6-40. These have a small "S" cast in to identify them.
Small Siler locks and finished tumblers assembled before 2012 use 6-40 threads. During 2012 a small batch was shipped by Chambers with 8-32 threads. Later 2013 tumblers again use 6-40 threads. Please check your tumbler screw diameter and pitch!
