OutBack wrote:
My 1957 175 prime fell apart in my hands while trying focus; and with this piece in place afterwards, it would not focus. Can I get an OH NO? Still works but you can not touch the lens barrel now while shooting without distortion.
Sounds like an element is wobbly, and thats what holds it in position. It may not go where you think it goes, you may have to take things apart and look for some other way it fits. You will know when you have it right when you feel the urge to kick yourself. That will pass and you may feel a little pride as it goes back together perfectly. It could be you have reversed an element.