My 1/2" electric impact took my flywheel bolt right off. Yours may have just bee installed by the Chinese Hulk that day on the assembly line.
The flywheel puller that works for us Hawk guys is an M16 bolt that threads into the flywheel and pushes against the crank. The one I used came from this type of puller (usage 3)
https://www.ebay.com/itm/3in1-Flywhe...wAAOSw9GhYdSYH
If you search a bit you can sometimes find one from a US based seller. Otherwise it is the slowboat wait.
Another trick for tightening down the flywheel bolt. Turn the engine away from TDC and feed some length of small rope through the spark plug hole into the cylinder. Once you go to tighten the bolt the rope will wedge between the piston and the head and hold the crank still so you can tighten it. Obviously make sure you can still remove said rope, so leave a bit of it sticking out of the plug hole lol. This method can also be used for removing the flywheel bolt if you don't have power tools.
The flywheel bolt doesn't need loctite, but it could be added if you desire it.
The case bolts I personally do put loctite on, but this is just me. As others have mentioned the torque spec for M6 bolts usually doesn't exceed 9ft-lbs/108in-lbs. Not only because they are small bolts, but they are also threaded into some very soft aluminum, and those threads will strip out quite easily if you over torque the bolts.