Jaco Pastorius made music history with a butter knife and a dream. Now it’s your turn. For just $27, get our complete DIY Fretless Conversion Course from Upton Bass and Build Bass. No fancy tools needed – just things like sandpaper, a sharp blade, a pair of nail clippers and your old strings. In one afternoon, you’ll give your bass that smooth, singing tone that stands out from the crowd. Less than 1% of basses are fretless. Be the 1%.