by Peter Alexander. This is the first of a two part series concerning triggers. These videos cover all the steps involved in creating a single trigger from scratch. A trigger is just a lever designed to raise the lock sear and hence fire the lock. Trigger mechanisms can be divided into two categories: simple triggers and set triggers. This video will cover the steps involved in creating a simple trigger from scratch on a Lehigh Valley rifle. Run time: approx. 100 minutes.   No. 862700