Skid plate holes have been stripped

Hi yes heli coil is cetainly the correct to way to repair. I am sure your mech knows that prob just trying to save you some labor. This kit will not drill the old ones out. You have to drill them and then install the helicoil once you tighten the bolts the helicoil will lock into place it will not come back out.

This is a time consumeing repair that involves careful drilling with precission straightness if it is done wrong what you end up with is hardened steel drill bits broken off in the bolts already broken. Could work out perfect could be a disaster.

The self tapping bolts are very nice also not much chance of them damageing your plate and would be a lot cheaper. Good luck