Balloon powered car 7 years, 11 months Other 2394 790 Duck 7 years, 11 months Other 2149 768 Bloxen, masonry 7 years, 11 months Other 1940 701 Screwless heart gears 7 years, 11 months Other 1809 754 Bag holder 7 years, 11 months Other 1631 854 Cheesy door stop 7 years, 11 months Other 1986 754 Difference engine v2.0 7 years, 11 months Other 2078 819 Lego 8x1 gear rack 7 years, 11 months Home 1719 726 Lego 16x1 gear rack 7 years, 11 months Other 2333 748 Dice 7 years, 11 months Other 2261 809 Train track - straight 7 years, 11 months Other 1592 723 Track - short curve 7 years, 11 months Other 1878 725