So I’m up with a CFI getting a rental checkout. I gots my trusty IPad mini in the thing that clamps to the yoke tube. He has his trusty whatever it was clamped to his yoke tube. The clamp thingy was bigger than any I’ve seen before. Not long after departing he says he needs to adjust it. No biggie, I just make sure I keep my fingers on the yoke. Later we’re doing something that needs me to get the nose down and it ain’t doing what I need. Yup, he had moved his clamp forward enough to interfere. Moral of the story is ‘controls free and correct’ is on the pre departure checklist for a reason and don’t be f’ing around with things that change that after you do the check. Another thing that was happening is I seemed to be having to fight the trim. It was a C177RG. I’ve flown them and fixed gear Cardinals before and they are very stable in pitch. I noticed he was doing a lot of stuff on his pad and doing it with heavy enough fingers that I think it was messing up my trim.