Here's how1. Find out which tire is leaking 2. Place the tire in a position that is relatively easy to work on3. Remove the nail. 4. Use the included reamer and pierce the nail hole to widen the hole. You must insert at least half the length of the probe into the track. Since it has to penetrate the tire's steel wire layer, it requires a lot of force. Use an introducer (without a splint) to check fixation. It must be large enough to accommodate the insertion tool and deep enough to reach at least half the length of the tip6. Apply lubricant to the tip of the insertion tool, pass through the hole again7. Place the busbar on the insertion tool, grease again8. Insert the tool fully into the hole----this step requires REALLY LONG force9. Fix the tire on the tire with the round piece on the insertion tool to prevent it from being pulled out10. Quickly pull out the pull-in tool, the tire should stay inside the tire and slightly outside11. Inflate tire to proper pressure 12. Check for leaks with soapy water