[S90]

So, is the insert that goes into that threaded hole the post that holds the strut??

It looks like there is nothing in that hole, it broken post? Just trying to understand how it could have failed with no visible damage to thread??

My thoughts which may be completely wrong is the post was loose, the fibreglass is not designed to take the load and when going to close the tailgate the post has ripped the fibreglass out?

This would mean the post was loose and not in its thread tightly, meaning not a manufacturing fault as such, although not torqued properly as it's not something you'd ever check for tightness.

I have a V90, so same tailgate. I'll try to get a look.