Cooking appliance and knob assembly thereof

A knob assembly for a cooking appliance, the cooking appliance comprising a cooktop, a heating element mounted to the cooktop, and a surface panel mounted to the cooktop forward from the heating element, the surface panel comprising a forward face and a rearward face, the surface panel defining a central axis extending from the rearward face to the forward face, the knob assembly comprising:

• a control knob mountable to the cooking appliance, the control knob comprising:
• an adjustable body comprising a push body, a center projection defining a body opening, and a center cylinder positioned radially inward of the push body;
• a static body disposed within the body opening of the center projection, at least a portion of the static body being positioned in front of the center cylinder;
• a first spring disposed around the center cylinder;
• a second spring disposed around the center cylinder, the second spring and the first spring being in a series arrangement;
• and
• a support plate selectively rotatable between a first discrete preload position and a second discrete preload position relative to the static body to selectively adjust the control knob between a first discrete preload setting and a second discrete preload setting.