I can get my big pop rivet tool in to the P clips on the spark plug wires. I had a bit of luck in that I thought my pop rivets were metric and they are, all except the smallest which is 3.2mm/⅛", which is the correct size for the P clips Thought I was nearly finished, only the spark plug wires to do and then I came across a: "who the £&$% did that" moment. Some idiot has cable tied the park plug wires with multiple heavy duty cable ties during one of its various chassis replacements, when the body was off. The cable ties are now wholly hidden and inaccessible with the body hard on top of the cable ties. I have just cut the old wires and pulled them through. Because I only have standard cable ties not the loop type for securing wires held away from the mounting surface, I will put a couple of wraps of rubber self-amalgamating tape on the chassis tube, where I am going to cable tie the plug wires. Had to stop to have a cool down. It is 34º outside today in the shade but I am in the sun. "Scorchio" as the Sun would put it.
Wilson