Hello all !! My name is kunaal, and i have made this 12 roller gantry set using customised plastic spacer blocks. the original plan is to use it for heavy duty for the vertical actuation of 6kg arm like structure. The problem i am facing with this is that ,though the movement is achieved, all the rollers are not in contact with the railing, the eccentrics are of no use in my design though i implemented them. i have attached a few photos for better understanding. Can this be rectified , i need some expert advice. Thank you.