Endoscope overcovers for wheels and handles

A medical device, comprising:

• a handle and a flexible member controlled by the handle, the handle including one or more knobs, each of the one or more knobs having a plurality of protrusions spaced circumferentially from one another;
• and
• a grip-enhancing feature configured to be removably coupled to a knob of the one or more knobs,
• wherein the grip-enhancing feature surrounds less than an entire perimeter of the knob, and wherein the grip-enhancing feature defines:
• a first tip and a first opening, wherein the first opening is configured to receive a first protrusion of the plurality of protrusions;
• opposing concave extension areas that meet at the first tip;
• and
• opposing grooves disposed between the opposing concave extension areas and the first opening.