Hi Diane, I had Camac levers installed on my Troub. I by a harp technician. I’m sure price is decided by what levers you choose and who does the work. Yes there are new holes drilled, but you can’t see the old holes unless you look really closely. It made an old unusable harp playable again, and it has such a beautiful voice. I also had oversized pegs put in so the thing would stay in tune since they all slipped.