I have some table legs I need to drill into to screw in (I think they are called hanger bolts?). Doing it by hand, I am not getting the hole perfectly straight, so the bolt is a little crooked. I saw the drill guides, but they are only like 10" or 12" high and these legs are 21" long. Any ideas how I can get this done? I am not a woodworker at all, this is just something I am doing for my wife and I am pretty clueless about all of this. Thank you very much. Tom