Hi I am looking for the roller ball with the holder that acts as rear wheel for Robot while in motion. Can anyone suggest from where I can get those. I believe they come as a part of extended kit sold by First. Unfortunately I cannot find this piece and wondering if anyone can provide some info as from where I can get this quickly. Appreciate any help you can provide. Thanks Ruchir -- Sent from Gmail Mobile -- To UNSUBSCRIBE or CHANGE your settings, please visit https://listserv.jmu.edu/archives/vadcfll-l.html and select "Join or leave the list". -- VADCFLL administrative announcements are sent via VADCFLL-ANNOUNCEMENTS-L. Visit https://listserv.jmu.edu/archives/vadcfll-ANNOUNCEMENTS-l.html to subscribe.