RE: MVVS 45 IRS/MG - spark plug getting loose
Late information:
Brisk prescribes 1/16 th turn tightening after the plug seats with light figer pressure. I tighten mine about 1/12th turn, probably because the extra inserted lower plug boot adds some extra deformation.
ZDZ specifies a torque of 30 Nm. This is more than the supplied tool is capable of.
Remove the plug tool's bar, drill the hole to about 5/16" (8mm) and insert a suitable 6" piece of piano wire or phillips screw driver.