Thanks for your kind comments, guys and girls . Hoborg - so those things are brakes ??? Good, now i know :) Why i've made some ? Well, if i put them off, the levers don't look like levers anymore to me . About the chains : i can't model them because my computer doesn't have enough horsepower for that . So i've used some simple rectangles with my chains shader . When i'll find a workaround to the transparency bug, i think they will do the trick . It's almost done now, so i'll probably have something to show tomorrow . Thanks again ! litst