Got mine built. I bought the tap/drill kit and handle at lowes. Make sure you get a handle big enough for the drill size. Some only go to 1/4". Might be better to buy the tap stuff at an auto supply store. I needed the Amazing Hulk to help turn the tap handle but I got it done. I also tapped another hole on the rail next to the recessed hole, so I would have more threads to bite. Anxious to try this out soon. Thanks again for the slider tip.