FIG. 1 is a top, front, right side perspective view of the shaft of a marking device;

FIG. 2 is a left side view thereof;

FIG. 3 is a right side view thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is a front view thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof.

In one embodiment, the broken lines shown are included for illustrative purposes only and form no part of the claimed design. For example, the broken lines include the handle, a battery cover, a paint holder, and a paint can positioned within the paint holder.