You guys, always making it so complicated. The answer is so simple- 'His' and 'Hers'... Two eyes, 2 ears, 2 arms, 2 balls, 2 breasts... Yes, all good things come in two's. So what we need is Two Otto's... Now, whilst I haven't seen it for myself, yet, I believe the owner guy of Otto... When he does live demo's... Well he uses 2 Ottos and using the plunge method... Well he churns out shots as fast as... Aaaah, well just 'fast as'.... The plunge method or just wacking it under the cold tap is straight from from this guy- he encourages and recommends it. Actually Craig is his name and from the couple of emails I've exchanged, he seems alright. OG 2 lungs, double shot, 2 legs 2 armpits, 2 nostrils but only one arsehole- go figure!!