I had a knocking in my front suspension which turned out to be a lose drop link bolt. I had new drop links fitted by the garage in March last year (2009) and when I spoke to them about this they said it was too long ago for them to be able yo do anything about it. My question is if the work was done properly with new nuts used and tightened to the specific torque, should this have really happened and should I challenge them further about this?