In the case of repairs which are subject to payment, first you receive a cost estimate of the repairs, after receipt of payment the repair is carried out and your Puma knife is sent back. If the repairs are being made under the guarantee, you will receive the knife back automatically after the repair. Enclose a letter with your address and a description of your complaint or your wish. Remaining stocks of the old blades and springs are not available either. Unfortunately, the new parts don't fit in the old knives any more. The design of blades and springs was altered at that time.