I had a thought that I don’t know whether has a definitive answer. Maybe it’s been answered here but with 2500+ comments, it’s a behemoth to find anything here…
That thought is, “What is the highest known mileage a single Schlumpf hub has accumulated?”
This can include repairs and maintenance, of course.
I recall this post - given that I believe I have read the whole thread and somehow absorbed the stuff like a Schlumpf obsessive:
(if you’re in a rush there’s a question in para 3 
)
Realised I had got lazy with my Schlumpf checking yesterday when I suddenly found myself flat on my back having been pedalling along happily in low gear a moment earlier. Turns out the crank on the knurled bearing side was working loose and had got to the point of pushing its button outwards so that it changed me out of low but not yet into high, so I was suddenly riding a both-ways-freewheel uni!
Tonight I have undone and cleaned everything and reminded myself of the wonderful process of cranking up to 50 NM with the special tightening crank bolt then switching to the fragile bolt and hand tightening it hard. With that and some ‘guessed’ torquing of the bearing cups I’ve got that wonderful ‘I wonder if the gear will change and if the knurled bearing will hold’ test ride to do tomorrow. Enough of that… I had a question too:
When checking all was back together properly I did the ‘press each button in turn and help the cranks move slowly round’ test. For me there was significantly less free rotation when going from low to high, and significantly more going from high to low. Is this normal?
If so it would help explain why I’ve not yet mastered shifting down on the move - not only do I have to prepare for suddenly pedalling much faster, but also the initial free spinning stage is for longer / further shifting down than when shifting up
The free rotation should be between 0° and 1/6 (I believe) of a rotation. Basically, it depends on the alignement of the clutches inside the hub (which move relative to each other. Have you tried it only one time (or going back and forth) or several times with several different hub rotations ?
I went round a full forward rotation of the cranks without moving the wheel, so pressing back and forth a lot of times. You mentioned going ‘back’ which I hadn’t thought of, so I tried that, pushing the cranks round in the back-pedal direction as I pressed alternate buttons in. The result in that case was that there was significantly more free rotation after changing up to high gear, and less rotation changing down to low gear.
Assuming it’s not an issue that there is consistently more slop going one way than the other, then for me it might help to flip the hub so I change gear up or down with the opposite button from what I’m used to. That way I would get the ‘big slop’ when changing up, when it’s easier to compensate, and the ‘small slop’ when changing down, making it less likely I’ll lose control before taking up the slack at a much faster cadence
I’m 15 years late but this suggestion was a lifesaver! I put Loctite on the silver button when I first assembled my G29 since it kept falling off. But now, after swapping from 150mm cranks to 138mm I was unable to remove it until I tried this suggestion. Thank you!
You’re welcome. I also get that sometimes, that I find very old information that is still useful 
Great to see this -
@jaco_flans well known in the unicycle scene for his handmade, beautiful Flansberrium unicycle frames, is here with us for training. He will support us in all areas of unicycling in the future, including service and repairs.
Sounds like we have a new authorised service centre in the making 
And seeing this has me strongly wanting to plan a Swiss side trip before, during or after Unicon to meet the great man himself.
It’s a geared up pilgrimage of sorts, isn’t it?!! 
I have been doing repairs for Schlumpf for already a couple years, Florian agreed to let me work without voiding the warranty in 2019 when I visited after Grischa Muni Challenge in Switzerland. But there was never an announcement, some riders still sent their hubs to Switzerland and had them fixed / maintained there.
Lets say last week’s visit had a bit more vision towards the future of Schlumpf Innovations Florian wants to spend time on his beautiful Time Machines and art, I want to keep this product alive! Right now there are only a handful of hubs ready to deliver (2 already here in Canada!), but there are a lot more ready to be assembled. I will be going back in Switzerland to assemble the lot and get it out there. From that point on, I will be THE service center for Schlumpf Innovations (and Time machines!) 
Announcement here :