new tracks need to be stretched before installation!

I found replacement rollers on ebay (broken bearing in one roller, but the timing track (yellow with nubs in middle) was completely worn flat on the inside. I bought new tracks from INYO pools, but they wouldnt' go back on! I created a frame that I could use to stretch the track, then also heated with a heat gun. ONLY after stretching could I reasssemble. THANK YOU FOR MAKING THIS page!