Best way to shorten hot end assembly by 1mm?

[Titan]

filing the nozzle down would have been the simplest and quickest.

Thanks, that's true, but I wanted a better solution that didn't require shaving 1mm off the end of every nozzle ever installed. Also if the nozzle isn't filed perfectly smooth it has the potential to affect the flow and adhesion of every single print. Lowering the sensor was the best option.