Getting the cams swapped out in the car is just about difficult enough to just go ahead and pull the engine out. I doubt there will be many to do it in car like the Zetec. Belts vs. chains and we pay the price...
The pics I have were taken this morning, just didn't have time to download since I'm working a second shift this week at work and I'm not adjusting well... need sleepy... Anyway, I should have the pics loaded in the AM. From what I can see, you will need to mark the cam sprocket with a black marker or paint marker in the three spots to know where straight up is at... somewhat... then, drill out the center expansion plug, the use a press to pull the gear off. The machine shop can build you a plate and drill the holes for the gear to line up with them. Weld the plate back on with a bit of reference to the marker/paint marks and you're done.
For those worried that the welding process would ruin the heat treating... I doubt it... After grinding the gear button to red hot with my angle grinder for 20 minutes, the cam itself was still cool enough to hold in my bare hands to release it from the vice. Since the tube never got hot enough to burn my hands, I doubt the cam lobes or bearing surfaces will loose their temper. Stick most of the cam in a bucket of water, or lay a drenched rag on it while welding the adjuster plate on and you'll be fine.
