Long long ago my dad had a boat and we ended up with one of his old downriggers. I got an older 89 270 Amberjack and would like to use this downrigger this year since it works. I will need a base for it but other than that it seems like its in good condition. However I was messing with it and its been so long and I was young. There are two knobs on the side of it. Any idea what they are used for? I am guessing the one at the back is some sort of clutch but I cant seem to get it to let loose of the reel. I don't