Yep, first post, just found the site. Would like to know what others are using to get under driveways, sidewalks, through stone etc. I was going to purchase a piercing tool from DitchWitch but found out the cost of the air compressor. After picking myself up off the floor, I promptly reconsidered. I had no problem paying the cost of the tool. Renting air is an inconvenience. Your comments and feedback are appreciated. Links to you product would be nice if available too. Thanks.