The TERRA-HAMMER is designed to use expanders without any modification.
First do your pilot bore with your TERRA-HAMMER mole.
In a second operation you can expand the pilot bore to larger diameters. The ground must be displaceable.
First do your pilot bore with your TERRA-HAMMER mole.
In a second operation you can expand the pilot bore to larger diameters. The ground must be displaceable.
