one of the more common ways to damage it is during removal for service - the tech used a metal tool to drive it out after backing it out of the threads.
BAD BAD BAD! Don't do that! A soft plastic or wood drift has to be used, and you must make SURE its backed out of the threads (so its easy to press out) before removing it.
I haven't taken an ATXanything second apart yet, but I've seen the diagrams. From the diagrams it is not obvious what the material is.
In any event it is nearly impossible to damage it to the point of needing replacement from actual diving.
It sounds like your shop did the common thing that they do to divers - they ripped you off.
BAD BAD BAD! Don't do that! A soft plastic or wood drift has to be used, and you must make SURE its backed out of the threads (so its easy to press out) before removing it.
I haven't taken an ATXanything second apart yet, but I've seen the diagrams. From the diagrams it is not obvious what the material is.
In any event it is nearly impossible to damage it to the point of needing replacement from actual diving.
It sounds like your shop did the common thing that they do to divers - they ripped you off.