I have a older model Mini Sneaker with a Onan25 hp. It does not have a boring attachment, but Iam considering adding one to i. Is this the best way to drill under driveways that are concrete or is there a better tool for this. Does anyone know of a cheaper alternate that will work. The Case dealer wants around $1600.00 to retro-fit the sneaker I dont think that includes the drilling rods ect.