So yesterday I decided to try out my Fatboy. First time it's entered the rotation and I was excited to give it a try. After my shower and lathering, threw in a Personna Red blade, set it to 3 and started out. WTG pass went very smooth. Didn't feel very aggressive which I expected and everything seemed fine. Re-lathered and prepared to do my XTG pass. Everything seemed to be going fine on the one side then started on my mustache area when all of a sudden the blade to seem to be really pulling and didn't feel comfortable at all. The blood began to flow a little but I continued on as I thought maybe I wasn't getting my angle right or something I was doing wasn't right. Finished up the other side of my face with a few nicks too and a little irritation. Was starting to wonder *** and checked my razor. I then found my problem. Somehow, where it was when I was turning the razor in my hand to use the other side of the blade or some other reason I couldn't come up with, I'd somehow managed to loosen the TTO knob causing the doors to open slightly and allowing my blade to become very loose in the razor. Basiclly there was enough room for it to float up and down a bit. Felt kind of stupid but I tightened it up and did an ATG pass with no problem. Still don't know how I managed to loosen the knob but damn it was not a good feeling trying to shave with a loose blade. I can see myself constantly checking the tightness any time I use the Fatboy in the future.