Advice Needed - AME Mess Up or..?

[tomcomet]

Originally Posted by JamesC

Never heard of a helicoil but looked them up. Doesn't sound like anything your AME did wrong. The threads were stripped some time ago so a helicoil was put in. They may not have used enough eg. loctite to help stop it from backing out. Installation requires a special tool which is about $1200. If the helicoil backed out cleanly it may be re-installable with this tool. Is the AME implying that he does not have this tool? or that he is not comfortable for some reason doing so ? Is the cylinder is too wrecked to safely hold the helicoil?
Note that I am not an AME - was just curious about helicoils.

Most airplane engines have helicoils in ALL the cylinders from factory new. They normally do not back out when the spark plug is removed but it can happen.