My Perform CCL lathe came with a bed extension and a swivel head stock. The max. bowl diameter over the bed is about 10" but could potentially be several inches more by swivelling the head stock. I would quite like to have a go at turning a 12-14" bowl but I'm struggling to work out how the bed extension would help. The banjo and tool rest, when placed on the extension, cannot reach the front of a bowl, with my chuck in place, when the head stock is rotated through 90 degrees. Are you supposed to rotate to 135 degrees (...never tried this) or do I need to buy some sort of tool rest extension?