Link to the Service Caster store for the caster used in this video: https://shop.servicecaster.com/Threaded-Stem-Poly-Wheel-Caster-p/pre20507zn-tpub.htm
This video demonstrates the procedure for installing a threaded stem caster into a wooden leg. Marking the center of the leg bottom is explained, and the hole to accept a t-nut is drilled. With the t-nut inserted, a threaded stem caster is screwed into the leg.
Please visit https://shop.servicecaster.com/