Hi Taylor,
When Maris took that photo the mainspring barely exerted any pressure on the tumbler when at rest so the flint cock would wobble back and forth when at rest. That changed when we added more arc to the spring and then hardened and tempered it. Maria may need to do that again to add even more power to the spring. We want the hook to rest a little bit up the toe when the lock is at rest. That way, the travel up the toe ends with the end of the hook tucked right against the instep of the tumbler when going from half to full cock. That creates a condition in which the tumbler rotates around the end of the hook rather than just lift it higher as you bring the lock to full cock. Consequently, there is significant let off of force needed to cock the lock. If you ever cock one of Jim Kibler's round-faced English locks, you will experience the same feature.
dave
