A simple winder is illustrated hear. I suggest drilling two holes in the winder, at the arrows. The outside hole is for a pin to keep the winder from slipping out of the hole in the upright. The inside hole is for the wire that you will be winding.
A more stable winder is illustrated hear the bottom bar helps keep the wire tension. Run the wire under the bottom bar then to the winding bar. The second stand shown in top view is for holding the spool of wire. Both winders can be clamped down to a workbench.
Top view of second winder