Seaweed & algae contain the full spectrum of organic (photo-synthetic) vitamins, all minerals and 78 natural ionic sea trace minerals, lipids, plant sterols, amino acids. Omega 3's and 6's, anti-oxidants, growth hormones, poly-phenols i.e. in short, it contains almost everything one needs to sustain life.
We recommend a Tap Wrench for tapping and driver tools. BIG-SERT OVERSIZED UNIVERSAL HEAD BOLT ENGINE BLOCK THREAD REPAIR Normally used when a helicoil or coil style insert has failed. 10 inserts of a 30mm length included in M11 & M12 kits.
FYI, I use iron heads with FPT copper header gaskets and FPT headers and have had good success. I also use studs (actually set screws with allen heads) and nuts. I think this evens out the torque load on all things involved. An added bonus is an easier installation and removal of the header.