Before you consider this project read these cautions.
1. The stock DeWalt screw has a bearing in the tip. The bearing helps prevent blade bending. This DIY knob will not have that feature. If you carefully flatten the tip of the screw you can minimize the problem. The instruction with the pattern show how to do this.
2. You can apply more torque to the blade clamp assembly with this larger knob. Do not over tighten the clamp or you could possibly break the clamp assembly. There is no reason to tighten the clamp to much. If the blade is slipping out of the clamp there are other issues.
You are going to need a 3/4" Forstner bit. A drill press is recommended but if you are careful you can get by with a hand drill.
DVD and the 2013 update DVD at this link. DVD #1 is $20 and contains over 1,100 patterns. The 2013 update DVD is $7.50 and has another 178 patterns.