Many suitcase brands choose to put tape with soft fabric on the outside on top of the screws. This is done to prevent the screws from rubbing on the fabric on the inside of the suitcase which could cause damage.
The tape has to be removed to perform the repair. If the tape is still sticking well it can be re-applied after the repair has been performed. For older suitcases the tape might no longer glue well. For such cases you can purchase some replacement tape from our shop.