Talked to a guy the other day that said he use to use a drive point with 1 1/4" threaded driving rod and driving cap on it to get under walkways and the like. The pipe is galvinized and he would just unscrew the point and driving end and leave the pipe for water. Never heard of doing it quite like that before. did see that my supply house carries all the stuff I would need. I ask because Iv'e done the water in the pipe junk and don't like the washout factor. Have any here tryed this before? Imput is welcome . Thank you.