Attaching clips to helmet for hans

Anyone who has done this, my question is what is the best method to pull back the lining (and not rip it ) from the helmet to get the wrench in there. Heat gun to loosen the glue - Impact nitro helmet.

 

Drill the hole in the helmet for the small bolt
Take the threaded washer and push it with a knife or flat blade screw driver betwheen the helmet fiber and the foam , normally the threaded washer is very thin , it will slide with a little pressure
check from the hole to aling it


Claude