Thatâ€™s interesting - I donâ€™t think Iâ€™ve seen a single picture with the grub screw at the rear.
All the bikes Iâ€™ve seen (including mine) have the grub screw towards the front. I certainly havenâ€™t knowingly flipped the cradle around.
Could you double check this for us please?
Perhaps we are talking about a different screw, but below is the screw I was discussing that I have seen flipped around (on the pivot cradle and labeled as "set screw"). I would leave it to the rear as the service manual recommends - but riders have moved it to the front to get more tilt of their mono extension.
Mitchell Mathews | Community Manager | Trek Bikes | @mitchmathewz