It is commonly known amongst Schlumpf hub owners that their crank arms will loosen fairly quickly over time. It's been a few months since I last checked mine, and sure enough they needed tightening.
It's recommended to torque them to 25-35 ft-lbs. I aimed for 30, but worked my way up from about 15. I'm always nervous about over-torquing. I was surprised to find I was actively tightening at about 20 ft-lbs. I had even used blue loctite in the past. It clearly did not hold.
For any Schlumpf owners who may stumble upon this post, I recommend you push the back of your wrench with one hand to keep the hex socket seated well while you tighten. I've rounded one of the Schlumpf bolts in the past.
I also added another 2.5 ml of grease to my Schlumpf. It naturally leaks some out over time, and it felt like it was time.
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