RW, I found a DT1 Rio in a bargain bin somewhere. Only one I have ever seen. Why you would need a WF for a 1wt is beyond me. I read the weight specs for somebody's 1 vs 2 lines and they weighed the same for the first 30, anyway. That light, it makes little difference, anyway, I think. My 1 worked just fine with a DT2F and I never had loading problems.