The bushing is called a bronze flange bearing from value hardware ,1/4 inch i.d. 3/8 inch o.d. 1/2 inch long, i removed the worn nylon bushing and hand filed to fit the o.d. of the new bushing to fit the hole in the window frame then used a little two part epoxy, two secure the bushing in the window frame so it wouldnt turn in the frame, i will try to post a picture,