Over compression is the biggest problem experienced in this industry. Most of the elastomers gaskets are already damaged even before they are being used. Think about the life expectance of a gasket that is over compressed.
The Torque-Knob prevents over compression by setting a Torque limit. The Torque-Knob is an easy tool to use. It fits almost all Wing-Nuts depending on the gasket material you can chose the specific Torque in Nm. Turn until it starts clicking.