I need a compatible ball RC200 (Manfrotto) to put on a slider homemade. I found this model quite cheap. It is all metal (aluminum) so solid. The quality of finish is adequate at best, but very respectable for the price.
The plate is compatible RC200 Manfrotto but has a little game. Nothing embarrassing for my slider. By cons, mount on a tripod, you have to see if this game is not a problem?