Schlumpf button fixings

Ok, photos have been uploaded here;
http://www.sowen.com/button/index.html
The coke bottle top isn't a replacement button... just there for size
reference

Well, anyway, I was unable to find my PTFE tape, however, as you'll see
from the photos, there isn't much thread sticking out to get the tape
on. (The pictures are with the shaft sticking out - when it's in, it
is well below the level of the surrounding nut). So I just put it on
dry.

I got the button on and adjusted it to the right level, then did up the
grub screw nice and tight. To check if it was tight enough, I tried
undoing it, and discovered 2 things;
* My shaft is slightly bent (or possibly one of the buttons)
* The left hand button has no grub screw!

I seem to remember putting the allen key tool in there a long time ago
and thinking that the grub screw must be very deep in there, but it
appears to have been grub screwless for months. Yet this one has never
come undone or been lost!

Anyway, both buttons are the plastic type, so I'm not sure how long
they'll last this time. I have got a pair of new metal ones being
shipped over from Switzerland, so hopefully if I do lose another one
then the metal ones will last longer.

STM


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semach.the.monkey wrote:
Anyway, both buttons are the plastic type, so I'm not sure how long
they'll last this time.



Threads cut in plastic tend to deform the plastic. The plastic
"shrinks" around the tap. Plastic threads therefore tend to bind by
themselves. You shouldn't need the tape to help the threads bind
against the metal shaft unless the threads have been expanded by
repeated insertion and removal.

Grub screw, grub screw, grub screw, grub screw, grub screw, grub screw.


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As I said, the left one should be tightening itself as you use it. It's
the right one that unscrews itslef based on the right-hand thread. a
left-hand thread here would work, but would be more expensive to make.


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semach.the.monkey wrote:
My shaft is slightly bent


hahahahahahah


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Det-riot wrote:
hahahahahahah



Well, at least you didn't say "hahahahahah - that's going in my sig"


Ahollow - Yeah, I can see why the left button should be self
tightening, but as the shaft is free to rotate, I don't think it should
make much difference. Still, with one well secured button on the
right, and an unsecured one on the left, we'll see what happens in the
next couple of weeks...

STM


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Spence, if you're missing a grub screw, aren't they the same as DMR
pedal pins? I'm sure I had a spare one hanging around for some reason,
and I can't think of any other reason I'd buy grub screws.

Joe


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my pics http://gallery.unicyclist.com/albuq44
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joemarshall wrote:
Spence, if you're missing a grub screw, aren't they the same as DMR
pedal pins? I'm sure I had a spare one hanging around for some reason,
and I can't think of any other reason I'd buy grub screws.

Joe



I've not got any DMR pedals I can check against, but as the left button
appears to have been lacking a grub screw for a few months, I don't
think it's going to be a problem. Or... by the time I know it is a
problem, I've lost the button anyway! Either way, I've got a new pair
of buttons on their way.

STM


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semach.the.monkey wrote:
Ok, I've had my Schlumpf for about 4 months now, and have lost 4
buttons* so far - which at £6 each, is turning in to quite a high
running cost.

The last one I lost was one of the original plastic ones, which I think
I may have over-tightened, but that was my last reserve one, so I've
had to commute in 1:1 mode this week while I wait for the replacements
to be shipped over :-(

Does anyone have any tips on how to attach them securely? The
instructions say *tighten the screw within the button very firmily
(torque 1.1Nm) *and then goes on to say *Please check that you can't
unscrew the buttons by hand. If so, you will loose them soon!* Now,
I'm not exactly sure what 1.1Nm translates to in terms of brute force,
but I'm sure I've done at least that, and they certainly haven't been
undoable by hand.

Any suggestions? Oh, and bare in mind that they will need unscrewing
if/when I change my cranks over.

Or should I just put a 'please return to...' note on the inside of each
one?

STM





Ok, it's quiz time. For five points, can anyone guess what I lost on
the way to work this morning?

(Sorry if this is not the same standard as you're used to with the
mikefule quizzes, but it's the best I can come up with)

STM


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Semach, I hate to tell you, but I've never had that problem, with either
the bike or the uni Schlumpfs. It sounds as though you may not have
tightened the grub screw grub screw grub screw enough (I want Harper to
speak that as he reads).

The best solution is a button made of aluminum, which would bind a bit
nicer on the axle threads than the current plastic ones.

The tape over the hole is a good safety measure, although it's still
possible for the button to unscrew itself even if the grub screw grub
screw grub screw is still inside.

And, of course, what does Florian say about this?


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One more thought: if you put some blue (mild) loctite or other
threadlocker on ONE button, you may still be able to get it off by
removing the opposite, and threading 2 small nuts onto the thin axle
actuator, thus giving something to resist the twist when you unscrew
the loctitied one. It's not a complete solution, but you may cut your
button losses by 50%, so to speak.


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