Recoil Insert Spark Plug

1. Drilling with the matched drill.
2. Tapping with the special screw tap for recoil insert marked threadspecification.
3. Put recoil insert into mounting groove.
4. Press recoil insert gently to roll-in hole,don’t slam the recoil insert in case of dislocation.
5. Then put thrust device into recoil insert, get rid of installing shaft with a hammer about 200g.