I just upgraded to a Hartzell CS from a FP Sensi on my IO-360-M1B equipped RV7. Model 72FM8S9-1-85. I also have the polished sensi spinner for the FP prop. I'm the second owner. I bought this prop from one of Vic S. RV clients when they also switched from FP to CS. I bought the spinner new and only has about 50 hours on it. If you're interested in the whole package (spacer, spinner, prop - you'll need new bolts) let me know and we can chat. I'm in the West Valley of Phoenix, AZ. Text or call 623-810-5six7five.Getting close to finishing RV6 with a 0-360 180 hp and looking for a prop. It is set up for constant speed but running low on funds so purchasing new is out of the question. I would also be interested in a good fast fixed pitch.