Loctite
Recently I read that Loctite, in practical terms, slackens off at about 100 deg C. Pouring boiling water over it should be enough. Guess what? It's true. Try it. Or faff about wiring, risking the laughter of racers, who all use Loctite. OK, and who wire it too, just to be sure...
(Top tuning tip: if you wire it up with a SLACK wire, and on subsequent inspection you find the locking wire TIGHT, then you know it is trying to slacken, and you need to use Loctite. Where did I learn this? By examining a works MV.
Now I use a hot-air gun (currently on sale in Lidl at £9.99, and one of the great bargains of the century). Not only can I slacken Loctite, but I can shrink heat-shrink sleeving without setting fire to the bike.
And if you don't like Loctite, don't go on aeroplanes. They're held together with Loctite.
Peter
Do NOT use loctite.
You will live to regret it when you have to take the shock absorber off.
As you have been adviced tighten fully and wire lock the nut.
regards Peter Bromberg