Peter

The system I measured was a T-Ball setup I believe... I didn't know the name until it was mentioned in this post but the diamond wires hook into a slot in the mast, I know that. The system is very low profile compared to what I used, which is the Ronstan RF43A mast tangs with drilled out top hole to fit a 1/4" bolt and locknut. Due to this extra height I still have a little binding... I never stopped to think it would bind even at this distance (300mm) from the hounds. At least next time I will test (somehow) before I drill and rivet things together. Oh well, upwind I now have more power... Downwind I just need to pull the spanner around a little.

Cheers and good luck.