I got my Toohr #3 two weeks ago. After tightening things up, I had two remaining issues. First, the spring did not hold the stones firmly enough for my liking. I solved that with a $1.50 spring from the hardware store. Now I don't even bother tightening the stone retaining screw, although I probably should. The second issue occurs with some blades shapes. To be fair, no high end knife sharpener seems to handle every blade shape with a single set of clamps. When trying to clamp smaller blades where the clamps have to take up too much of the blade width, you end up with the clamps interfering with the stones in two ways when trying to achieve lower angles. This shows up on one of the Ukrainian videos when he tries to sharpen a Mora clone on the Toohr 3. First, the screws protruding from the other side and interfere. Shorter screws solves this easily. Second, the clamps do not come to a point at the end, so the somewhat tall ends of the clamps interfere. I solved that by filing the clamp ends down to an almost sharp point at 15 degrees. Now I think they will work for nearly any blade, although I think it is impossible for a single clamp design to work for any conceiveable blade type. A couple of other notes: I did not know how much I would love the ability to slide the tower...it really helps you keep the stone perpendicular on long blades. The pivoting mechanism shows no measureable change in sharpening angle when clamped to a straight steel ruler, but with real knives having different shapes, both the blade shape and the care of the user in clamping come into play. Clamping and measuring a dozen differrent blade shapes, I got differences in angles when I flipped from 0.0 degrees to 0.3 degrees, the worst being with some odd shaped blades that were hard to clamp symetrically. I don't think there is any universal clamp design that could be perfect with any blade shape and size, so for me this is acceptable because of the design of the angle adjustment. If I want the angle to be maintained exactly to the tenth of degree, it takes me litterally a few seconds on each flip to re-adjust. A couple of hours of work and a trip to the hardware store and I feel that this is almost like an $800 machine and in some ways (the sliding tower) better. Ask any questions you want and I will try to answer.
