Well the take away from that & just bout eery other monkey with a tension wrench video is just about all of them are as strong or stronger than the bolt
I am not a fan of helicoils in BSF as the wire is no longer the correct diamond shape it once was so they tend to strip the threads off the bolts if overtightened.
I run some shadows as hire cars and it was interesting when I first took a spannar to one and noticed every hole in the alloy was helicoiled, including the plug holes
Fail to put some lube on the plug threads and you can forget about changing plugs
The mobile thread repaired ftted bronze ones and that was the last time We ever had a frozen plug