I had misplaced my primer catcher for one of my RCBS presses during a move a while back. So I devised a way to make my own using a plastic Pepsi, or might have been a gatorade bottle. But the point is, I liked it so much, that when I eventually found the original catcher, I decided to just keep it stored away, and instead I use my new fan-dangled invention, and I don't have to pick up spent primers off the floor any more.
RCBS has great equipment, but their primer catchers just don't work all that well. Anyone interested creating a better way, just think heat molding to fit a plastic bottle of practical size and shape to the press and ram. Aside from the OP's neat little invention, I have seen other creations over the years. Come on RCBS, you can do better than this, and especially considering the simplicity of the application.
GS