Hey,what methods do you all use to get under an existing cement walkway ,say 3' or 4' wide? Do you use the dig and highpressure nozzle /w water method or what?Right now that's the only way I know .I rigged up a 3/4 pvc pipe w/ a f/m swivel hose coupling and shut off on one end and a brass high pressure nozzle on the other end and blast my way thru, This method does not work well for me,alot of granite around here. Also I don't like waisting all that water. But in the Manufactured home park I'm doing alot of new landscapes in,I can't get the cement guys to remember to put a line under the walkways before they pour. When my nephews were pouring there no problems but this new crew just laugh at me. Well not to my face they don't but they aren't doing it either. I offered to provide the pipe ect and lay it in.But they just shine me on. I could get them in trouble for that but don't want to be that way. I'm no snitch but I can pull strings if I need to. Anyway how do you guys do it??