If everyone is having the same maintenance problem its a bad design = design defect.
Changing spark plugs isn't difficult and shouldn't be -- except in a ford.
By the way if you follow the Ford procedure their is still a very high probability that you'll end up with the stripped plug blow out problem. And ford recommends a head replacement - and a number of dealers recommend a new motor as the cost of the head replacement is high
The problem is that they didn't leave sufficient metal / or use a stronger alloy in the heads where the spark plug threads are. When you remove the plug you end up tearing out some of the surrounding metal. The new plug goes in without sufficient good threads to hold it in and it blows out.
Again design defect
just because you were the exception and had good luck doesn't diminish the problem
If it was simply some one over tightening the plug until it gets easy then I'd agree with you.
But from everything I've heard it's more than likely the removal that's causing the problem.
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