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1. If the drilling block off-center is encountered during use, it can be adjusted. 2. Use an Allen wrench to loosen the screws on both sides. 3. Adjust the big rod in the middle to move the drilling block into the middle position. 4. After adjusting the block to the middle position, tighten the left and right hexagon socket screws. 5. Twist the rotating rod to check whether the left and right distances are consistent. If they are consistent, it means that the drilling block is in center. If there are still deviations, please repeat the above steps to adjust slightly. 6. The left and right distances are the same after the adjustment. If you still not very clear about that. You can contact with us. We can send the picture or video about the adjustment to you.