Honed the other strut with an extension bar connected to the hone, this allowed me get all the way to the bottom of the strut.
The insert went in fine
Morale of the story....
if your bilstein b8 don’t fit in your 51mm strut then there is probably some heat distortion within the tube
A bit of patience, a hone and an extension bar will sort this and you will still be able to remove the insert in the future
