Gold Dredge and Highbanker Plans | My Home Workshop
23/10/2012#0183;#32;Next you will need to mount your hopper box. Do this before you build your riffles because you need a little bit of space (6 inches or so) before the material hits a riffle. This will keep the box from backing up. To build the riffles, I measured out the width and built a wooden jig the exact width of the box.