Jack, When you enter the bulliten board, scroll down, until you see your firts original message of 11-2-97, and click on the message right below it. I'll answer your question anyway. A pilot hole is something that you NEED to do. Like when you fasten two pieces of oak. You need a pilot hole for your nail so you will not split the wood. Predrill is the operation of making a pilot hole. Like I need to predrill for my pilot hole.