did another cam belt change on the puma the other day. and tried something new on the crank pulley bolt. first stage tightening is not that hard with a holding tool for the aux belt pulley. then just make a scratch mark in the bolt and pulley. take out the impact gun. set it low. and let that tighten the last 90 degrees.
i do have to tear it all a apart again thou since i got some major oil leak there somewhere. yeey fun... some seal must have failed. probably the top cover seal which i tried to reuse.
Chris Allison has done a video.
You may find it helpful, as there is a lot of details and advice.
Chris did the stage 1 engine service on my Medium Steel blue Puma and did a very thorough job, car is far better to drive now, as I suspect the Ford main dealer, who had previously changed the belt for the previous owner, had not paid the same attention to detail.