I've mostly finished my build and opted for mechanical shifting. In hindsight, I wish I'd invested a bit more in wireless, as the process turned out to be quite challenging. The handlebar holes were particularly difficult, and using a soft cable cover (neoprene) only created more issues. Now, I'm dealing with a seized seatpost. It seems there's excess carbon inside the seattube, forming a lip that initially prevented the seatpost from fitting properly. I managed to remove the lip by turning the bike upside down, but now the seatpost is stuck. I've tried WD-40 without success and gently tapped it with a mallet, but I'm concerned about damaging the frame or seatpost.
Any ideas?