You cannot replace individual components like the small 1/2" inner circular clear piece separately, as we only offer the entire spring assembly for replacement. Our replacement springs come from Irvine Door & Shade Company and are not interchangeable with parts from other manufacturers, including those made in China. To find the correct spring, measure the diameter of your current spring—common sizes we offer include 0.75", 1", and 1.25" diameters. Although your shade is made in China, our springs can still work if you choose the correct size. The 1.25" slow-rise spring at 18" length is a common option, but ensure that you verify your spring diameter carefully before ordering. For precise fitting, we recommend measuring the spring diameter itself rather than relying solely on roller diameter measurements. You can learn more and shop replacement springs on our website to find the best match RV roller shade.