You can place a small finish nail through the spindle and then "set" it with a nail set.

A nail set is used to sink the nail into the wood as oppose to having the nail sit flush with the wood. Usually after using the nail set and driving the nail into the wood, one would take wood putty and fill the hole so the nail would be "invisible" to the naked eye.

Nail sets are also called a nail punch. They are used to drive the head of a nail flush with the surface or below the surface.

Pin-set or nail-set pocket watches. Keyless winding. These pocket watches had a small pin or knob next to the watch-stem that had to be depressed before turning the crown to set the time and releasing the pin when the correct time had been set. This style of watch is occasionally referred to as "nail set", as the set button must be pressed using a finger nail.

1) Cut your nails

2) File your nails

3)put some good nail polish on it (no dark colors)

A nail set is also a small hand tool.

It is a small punch, used with a hammer to insert the nail beneath the surface of the wood