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A suspension guy told me that spinning the rod with an impact wrench should not damage your inserts. The bearings around the rod allow the rod to rotate freely. If the rod is spun too much too quickly (impact wrench will spin the rod gradually, not very fast) or too much dirt accumulates, than can cause the bearings to go bad and make noise. The only thing I can image causing inserts to go bad would be dirt accumulating down into the body and puncturing the insert (not even sure if it's wet or dry) or normal wear over long term use.
The damage from an impact wrench you should be worried about is stripping the rod threads from over-torquing. But if you were able to tighten the top nuts in LA without issue, then your threads are fine and you have no damage. But I am no expert. Try calling up Bilstein here in SD during business hours. Their tech support guys are helpful and can answer any of your nagging questions.
We have a Bilstein corporate employee in our SD86 FB group. If you ever run into issues, I can point you to him (he bought stuff from me/is in my friends list/same first name as mine).
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