I have an extra Light Stand Spigot. I kept these in my studio in case one was damaged on a light stand, usually the thread. The stand could then be immediately repaired. It is in Like New Condition and comes with Two Rubber Protective Caps. Contact me for more information. $6
The exterior of the spigot measures 5/8", which is an industry standard size for mounting most light fixtures. The threads at each end of the spigot allow you to screw on accessories that have female 1/4"-20 or 3/8"-16 threads.
You can pick it up in Franklin, MA. I can meet you in the parking lot of the Franklin Police Station. I can also ship it to you by USPS if you pay with PayPal.