Was putting the finishing touches to the head rebuild on my Saff tonight, timed it up and put the belt on then turned the engine by hand to double check the timing.

Problem is, the cam belt tensioner seems to be sitting too close to the head and is pulling the belt towards the back of the cam pulleys.

Should there be a spacer between the head and tensioner (I don't know if there was one on there before as the tensioner was still on the head when I took it to the engineers) and if so where can I get one tomorrow, or does anyoe know how thick it needs to be so I can try and find something else to use?