Yes I think you are right, but after 2 bad experiences with the DCi rack I was reluctant to splash out on a new one after pricing one up with Renault Wolverhampton!
Ive had loads of trouble with what appeared to be decent secondhand ones based on inspection and testing before fitting being rubbish when actually put under load on the car too mate, so I feel your pain! In fact I fitted a replacement one last weekend for exactly that reason on our 182.