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.
The use of helicoils or inserts, such as a Time-Sert is pretty straight forward. For any size tapped hole you can buy any of the various solutions in a kit that includes all of the materials/tools required. The bigger question is which solution is right for your application. The quality of the repair is pretty much subjective.