I gave him the URL for bike forums, but for one reason or the other hes afraid to post here.
His bike.. well the brand escapes me. Its a few years old, boardline X-Mart bike, but not quite.
Now hes having a problem, whenever hes going over rough/bumpy terrain there is a sort of buzzy vibration hes experiencing other than the thrashing from the trail. Theres a slight sound associate with it, and he says it seems to be originating from near the front derailer.
I'll also add that his chain is pretty slack
Think it could be BB related?