Well Bobbo_ZA, I used 4 rare earth magnets about 1/4 inch square epoxyed to the shaft. The bottom of the shaft sat on a single ball bearing as the thrust bearing. the upper shaft outer bearing was made from a piece of teflon rod, drilled out to slightly biger than the shaft diameter. I calibrated it in the car, on some old country roads when there was no wind early in the monring. The main shaft was made out of stainless and the cross arms to hokd the cups were made of brass rod. I used a hall efect switch for the pickup and it was housed in an outside vertical junction box.

Dave Purola,
N8NTA