I basically looked at a picture of the tool available on Ebay and then took measurements on the truck and reverse engineered it. It looks just like the professional ones you can buy.
This is a really good idea! My boyfriend is an engineer. Im going to see if he can make the tool for me so I can change out my plugs haha... Ford quoted my $350 to change them out. Insane since the whole breakage issue should be their responsibility. Im up to 65k on miles and do not know if the plugs were ever changed. Bought the car used. Im assuming that hey have been considering the milage but who knows.... Awesome idea though!