Hi copelab
I made my own bender and have been bending piano wire front gear for maybe 40 years, As I recall, I have some interference with mine also. I lift the wire over the interference and lower it as soon as possible. I suggest you practice the procedure a few times to find the best method to get what you want. I always purchase extra piano wire since I do not use the bender often enough to remember all the tricks so I discard a few pieces.