a method for reforming or rerounding an underground pipe includes the initial steps of inserting a reforming tool into the underground pipe and locating the pipe reforming tool at a location to be reformed . at least two arms of the reforming tool are then extended into engagement with the inner periphery of the underground pipe , which arms push the underground pipe outwardly in a manner effective to change its cross - sectional shape . the arms may then be retracted and the tool withdrawn from the pipeline . such “ reforming ” or “ rerounding ” tool is preferably mounted at the distal end of a rod string so that the tool can be pushed , pulled and / or spun by operation of the rod pulling and pushing machine powering the rod string .