What is everyone doing about the dimpled firewall effect you get when you tighten your motor mount bolts up to the hard firewall with 3/8" of soft fiberfrax behind it?    I thought about putting phenolic spacers behind each bolt but not really interested in the time to do it.  I dont care if my firewall is dimpled I just want to make sure its safe.  Anyone else have the dimple effect?

Bryan
Lancair 360