E este sistema:
(https://clubeportuguesmaxiscooters.org/forum/proxy.php?request=http%3A%2F%2Flh6.ggpht.com%2F_9UDQFmjoVz0%2FSzfoLs1MAoI%2FAAAAAAAABkQ%2FqD543VoMwiU%2Fs400%2FImg029.jpg&hash=c70d08804b846e98c5d90148b30074fa60c0b11d) (http://picasaweb.google.pt/lh/photo/xKfn7L5x9TpEoh6j9cEu-Q?feat=embedwebsite)
(https://clubeportuguesmaxiscooters.org/forum/proxy.php?request=http%3A%2F%2Flh3.ggpht.com%2F_9UDQFmjoVz0%2FSzfoL5egdGI%2FAAAAAAAABkU%2FLjAp-KUr2hs%2Fs400%2FImg030.jpg&hash=f7332624a8034e60b09e8842a88abac25014048a) (http://picasaweb.google.pt/lh/photo/mmYnutYkgYxX76I3RIWDFg?feat=embedwebsite)