Ok, so the worst thing is that I did it with a new torque wrench. I kept turning it thinking it would click as others I’ve seen have, it didn’t feel that tight but the torque wrench is much more heavier tool than just an Allen key. I basically got a new torque wrench and didn’t know how to use it properly…. Using it on my best bike first was a bad idea in hindsight!! Numpty 🙁
It’s not a new build, I bought it second hand, but wanted to change the stem.