How to expand the hole when installing the transparent PC endurance board?

Transparent PC endurance boards are usually drilled on the board, with a suitable spacing of 50cm between the holes. It is recommended that the distance between the holes and the edge of the board be at least 3-5 cm. The diameter of the rivet head of the transparent pc endurance board should be twice larger than the diameter of the handle, and a gasket or washer should be added to avoid damage to the PC board caused by local high pressure. The screws of the transparent Pc Endurance Board should not be tightened too tightly to avoid fracturing the board. It is better to allow slight displacement of the board after fixation. It is not advisable to use PVC gaskets or waterproof tapes containing asphalt components, as the chemical additives they precipitate can cause chemical corrosion to the board, leading to cracks or even fractures on the surface of the board. When processing cold bent transparent PC endurance plates, avoid using screws to fix the bent parts. All pores should be filled with neutral silicone structural sealant to prevent cleaning agents from penetrating the edges and affecting the use of the board.