Ideal for longer blades
This works well. Best for longer length carbon steel fixed-blade knives like the Ontario RTAK II or Cold Steel machetes where a scary sharp edge isn't needed. For best results I recommend clamping the blade to a shelf edge using a couple of G-clamps. Use one clamp to hold the the blade vertically, tip up / handle down. Use plywood strips so the clamp isn't touching the blade directly. Clamp the knife so the blade spine is closest to the shelf edge and the sharp edge is on the outside nearest you and at 90deg to the shelf edge. Use the other clamp to secure the first clamp to the shelf. Then work out your sharpening angle and go for it with the puck sharpening in small circles, coarse side first, then medium side. Far easier to maintain an angle accurately with the blade held by clamps. There are also less risky things to do than trying to hold a 19" blade safely in your hands while trying to sharpen it :-)
