On 28/07/2015 06:10, Arno Kletzander wrote:
metal ball heads with a hex base on threaded posts are available as spares for R/C cars and similar
Those are ball joints for servo arms, we use them on helicopters too. But ones I've seen are too small, and I don't think you'd get any with long enough stems and the right diameter ball.
-- Pete Pete Turnbull
