After buying my first mgtf last october with some history,,,,,,,but none suggesting the cambelt had been changed i set upon myself to tackle the cambelt.......The belt after investigation appeared very good a gates one at that........but wanting piece of mind i renewed belt,tensioner,pump and altenator belt............and put it all back together wow my first cambelt change..............then i began to read the manual a bit more i noticed it said discard and renew patchlok bolt to my automatic tensioner........is this absolutely essential or is it a waste of time stripping my car down again.........i noticed tensioners for sale on ebay ,but not the bolt................can anyone help