Hi Ya'all Does any one remember the old Swan 250? It used 6146 finals, I think. Some folks replaced the 6146's with a Sweep Tube to get more power out of it. The Sweep Tube had a thick carbon plate is all I remember. Can anyone tell me the Model number of that Sweep Tube? Thanks for digging back into the memory banks. 72/73 de Stan W5ZF #6183