I don't use a wrench on the front bolt; I use my fingers. I use a ratcheting 10 mm wrench on the rear bolt. I found it on the road. Actually, I found two ratcheting 10 mm wrenches on the road, but I didn't pick up the second one, because the first works perfectly. So it's just trial and error to get the saddle level perfect. If it's tilted up a little too much, I back off the rear bolt, use my fingers on the front bolt to tighten it down, then retighten the rear bolt with the wrench. Once you get it perfect, there's no need to "screw" with it anymore ... unless you just like messing with the 10 mm ratcheting wrench that you found on the road.