I have a 1978 gamefisher trolling motor on the bow of my crawdad. I have the orig weed guard which mounts on the motor housing and it works pretty well. I also have the prop high so the weeds dont build up on the shaft but that is what gets you. It's a real pain. Thanks for the weedless wedge info but they dont have my model and I dont think my motor has the sack to turn into a salad shooter. you might want to check this out. This guy takes a bass boat straight through a weed bed I could walk across with no stalling. It is a bar of some sort that deflects the weeds. Here is the contact
http://www.youtube.com/watch?v=V3ZXpqoBQ78. It's called GEAUXrilla Guard. I havn't tried one but it looks good.