nah ive been riding abit with it today and it runs fine no need for a jubilee clip, yeah i found that the kmc kool chain runs smoother upside down, my mate does it to, i made it out of a peice of aluminium, and an old jockey wheel from a rear mech, couple of washers and a bolt n nut, jobs a good'n', i then sprayed it white just to mate it look abit neater, im pleased so far seems to be A OK EDIT:hasnt gone slack tom