Abstract: A wheel, by which a base is configured to be wheeled across a floor, includes a tread and a hub. The hub has an inner surface that surrounds an axis and defines a bore. The hub further has an outer surface surrounding the inner surface and a slot extending radially outward from the bore to the outer surface. A shaft is centered on the axis and coupled to the base. The shaft is configured to be received in the bore and has a groove. A clip is configured to be attached to the hub in an installed position in which the clip extends from within the groove outward through the slot to secure the hub to the shaft. The installed position is axially between the base and the tread.

Abstract: A hub has an inner surface defining a bore centered on an axis, an outer surface surrounding the inner surface, and two slots extending in radially opposite directions from the bore to the outer surface. A shaft is configured to be received in the bore and has a circumferentially extending groove. A bent wire spring clip is configured to engage and mechanically interlock the hub and the shaft. The clip has a C-shaped section, two diametrically opposed bowed sections extending from opposite ends of the C-shaped section, and a two straight end sections respectively extending from ends of the two bowed sections to two distal ends of the clip. The clip is configured to have an installed position in which the bowed sections of the clip extend circumferentially in the groove at opposite sides of the shaft, and the end sections and the C-shaped section extend radially outward through the slots.

Abstract: The practice aid includes an annulus for resting on the margin of and about a golf hole. The annulus includes a central opening and one or more downward projections for disposition within the golf hole to prevent lateral displacement of the annulus from the hole. Visual indicia identifying one or more target locations are provided on the upper planar surface of the annulus at spaced locations thereabout. The visual indicia may comprise differently colored segments to facilitate alignment of the putt and enable the golfer to putt the golf ball through tile central opening of the annulus into the golf hole. The practice aid enables the golfer during actual golf play to visualize a target area about the hole and thus focus and concentrate on putting the ball to that target location.