Anybody know the size of this thing? Have taken mine out a couple of times to cleanup inside and the head looks like it's getting boogered up a little. Hate to strip that head. Thinking about replacing it with a torx head. Because I put Loctite on it every time, it takes a little force to bust it loose. 5/64" allen. I'm sure it's a standard thread. I can cut and grind if I find something longer. Case hardened?