We strive to provide high-quality products for our customers. For customized products, challenges or errors in production processes, materials, and heat treatment etc can sometimes lead to deviations. To avoid our customers receiving unqualified products, we will inspect every batch of gears before shipment and issue a complete quality report. We will only ship after your team approves the report. If the gears are found to be out of tolerance before delivery, you can choose repair, remake, or refund. If the customized gears fail to meet the dimensions in the drawings after delivery, please contact us immediately with photos, a description of the problem, your original order number, and the drawing version. Our engineering team will conduct a technical investigation. If the gears match the drawings, but the drawings do not accurately reflect the dimensions of the mating components, our technicians will work with you to determine the correct parameters. If the discrepancy between the gears and drawings is due to our manufacturing error, we will provide repair, free remake, or a refund. For design changes proposed after production has begun, we can suspend the order and provide a new quote, but materials already consumed will not be refunded. Maintaining transparent communication at every stage helps us resolve issues quickly.