I have a couple saddles (Brooks Pro and Ideale 80) that have small rivets which are a bit proud of the leather surface, both near the nose and back at the cantle plate. I can definitely feel them if my butt or thigh slides over/past them. Is it okay to try and set them into the leather, or am I just going to ruin the leather? (I an take some pix tomorrow, but it's too dark now.) Thx...