New castings for the large Siler lock. Notice the toe geometry. Tipped forward for fast action with the over-center cam on the frizzen spring. This frizzen is slotted for use with the anti-friction roller, included.
The frizzen spring has a fancy leaf finial, and an improved cam ramp for the roller frizzen. Spring is hardened and tempered, ready for use. Frizzen is annealed. You fit the frizzen to the plate, drill the frizzen through the existing plate hole, and harden the frizzen.