Heat and unscrew all the cap screws.
Hexagon lobular socket head cap screws--Property class 4.8
Easily installed with cap screws from either side.
Tapping is the process of cutting a thread inside a hole so that a cap screw or bolt may be threaded into it.
Hexagon lobular socket head cap screws--Property class 8.8
To adjust the setting of the valve, loosen locking cap screw with hex wrench, see Figure 3.
