25 years ago I needed some chair leg slides. I used a piece of furring strip and put 3/4" holes about 1/4" deep. I put 1" nails through the center of each hole but left them "proud" about 1/8". I cut up 5 jugs into a clean tin can. With a box fan blowing fresh air I used a heat gun for stripping paint to melt the chips and poured the liquid plastic into each hole. After the plastic cooled (turned white) I split the wood lengthwise and the chair glides fell out ready to use. After 7 kids the glides are still in place.
If you need a starting project for recycled milk jugs this is a good one.