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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.
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