Protective sleeve for use with extension bar

An assembly comprising, in combination:

• a protective sleeve;
• and
• an extension bar comprising a detent and a button for controlling the detent, with the button having a first height extending radially from the extension bar and being pushable into the extension bar to a second height extending radially from the extension bar less than the first height, wherein the protective sleeve defines a hole and an aperture communicating with the hole, wherein the hole receives the extension bar when the aperture receives the button, with the protective sleeve defining a recess for receiving a user's finger, wherein the aperture is located within the recess, with the button extending into the recess at the first height, with the protective sleeve comprising a thickness extending radially from the extension bar and outside of the recess, with the thickness being greater than the first height of the button, with the protective sleeve comprising a periphery with a cylindrical portion and a frustum-shaped portion sloping from the cylindrical portion to an axial end, wherein the frustum-shaped portion of the periphery of the protective sleeve slopes to the periphery of the extension bar in the same direction that the protective sleeve is put on the extension bar, with the cylindrical portion including the thickness, with the recess formed in the cylindrical portion and the frustum-shaped portion and extending to a location in close proximity to the axial end of the frustum-shaped portion, with the cylindrical portion and the frustum-shaped portion each having an axial extent along the extension bar, with the axial extent of the frustum-shaped portion being greater than the thickness.