- The cap on top of the stem I tightened with low torque (around 2,5 Nm) as I believe that's just for the cap to not move and it's not important for the headset itself or am I wrong? (The manual for Dogma says to preload to 2 Nm and then 6 Nm max, but I seriously don't understand why, as the cap is installed as a last part to just cover the stem, so why even preload it? I think the expander plug has to be preloaded before installing the stem or am I wrong again?
Is there enough of a gap with your steerer tube and top cap? There needs to be a gap so everything can squeeze together. Something akin the my attached image.
I am using a Pinarello compression plug and had to sand the VB top cap to allow enough space for everything to compress. I also swapped both bikes over to OEM Pinarello top caps as they fit the handlebars better looks-wise.
The order of install should be
1. Torque compression plug to required nM
2. Install fork to frame
3. Spacers etc.
4. Handlebars
5. Tighten top cap FIRST to compress everything on itself
6. Set handlebars straight then tighten grub screws