Hi everyone,

this is my first post, I've posted the following in other forums, hope someone can help me:

The tailpiece studs on my SC 25th anniversary were too tight, I just wanted to get a lower action and I couldn't do it, was quite difficult to take them out, I needed a large tool and a lot of effort, the thing is that I ordered some more studs at the Europe dealer, and they have the like vertical lines, wich deforms the thread under my point of view,they were too tight due to the vertical lines on the threads , are this lines normal? Common? The old ones and the new ones have the same vertical lines on the threads, 3 each stud, does anyone have the same???
see photo.