Buddy and I were fishing off his boat last weekend on barren and a storm blew up. I was rushing helpin him get everything back to the cabin and was undoing his lowrance fishfinder which I believe is the HDS 5 model with the two screw handles on each side. Me baing the dummy I am screwed the knob holding the fish finder in place all the way off and plop. It falls in the water. Of course being the right thing to do I told him I'd but him a new one. But I get online today and all I find is a pair of knobs for $40 and they don't even look like the right thing. All I need is one. Was thinking g they would be three or four bucks! Does anyone know where I can buy a set that maby aren't made by lowrance and are cheaper or where I can find the right knobs. Thanks! Drew