I modified a couple yesterday, used a #3 split ring, haven't fished them yet, but giving them a shake test and the split ring/treb were swinging freely. Modified a 3/8 and a 5/8. Hard to find the 5/8 for sale on the tackle sites, did find one site that had them, Mondotackle.com, but they only had them in black. But they are available on Ebay in the light colors.