Need to 'turn' a couple of door roller 'stays' and am wondering which 'plastic material' to use; needs to be (approximately) 1-1/2" with a 3/8" thru hole. I have PVC rounds on hand but PVC is sensitive to light and gets brittle. Barn has 9 doors and the existing stays on 6 of the doors have been in place for 30 some years and have weathered well. They were originally black in color but have now weathered to gray. Suggestions???