Cinelli 1a stem handlebar bolt spinning
11-18-23, 01:33 PM
#51
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Well, I gave up with this stem, but not in the way you think.
The best thing to do was to remove the bolt, inspect for damage and try to put the bolt back in a way that would hold better the next time around. Using different Allen wrenches, I slowly got the nut to hold to make a tiny bit of progress. Went from a 2mm Allen to a 4.5mm Allen with this grip:
At this point, I wasn't able to pull hard enough to get the nut to "stick" anymore. But what I was able to do was mount some handlebars in it. Initially, these were just supposed to be a passive wedge, as my Allen wrenches marred the stem something awful. But with diminishing returns as they were, I gave up and started cranking down the other way on the bolt.
After a little struggle, I got the nut to stop spinning and cranked down hard. The nut is now embedded much deeper in the stem than before, a good sign that I might have some luck removing it someday.
But that's not my plan. I can hopefully go the rest of my life without ever loosening this bolt now. If the bars go, the stems go, and what I have put together let no man separate.
The best thing to do was to remove the bolt, inspect for damage and try to put the bolt back in a way that would hold better the next time around. Using different Allen wrenches, I slowly got the nut to hold to make a tiny bit of progress. Went from a 2mm Allen to a 4.5mm Allen with this grip:
At this point, I wasn't able to pull hard enough to get the nut to "stick" anymore. But what I was able to do was mount some handlebars in it. Initially, these were just supposed to be a passive wedge, as my Allen wrenches marred the stem something awful. But with diminishing returns as they were, I gave up and started cranking down the other way on the bolt.
After a little struggle, I got the nut to stop spinning and cranked down hard. The nut is now embedded much deeper in the stem than before, a good sign that I might have some luck removing it someday.
But that's not my plan. I can hopefully go the rest of my life without ever loosening this bolt now. If the bars go, the stems go, and what I have put together let no man separate.
If you got it tight the way it is, you should be good to go.
11-18-23, 01:41 PM
#52
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You would probably have to shim it and that will also put pressure on the nut side so it may bind the back side too much.
11-18-23, 01:46 PM
#53
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Punch head and drill.
Centre punch the cap end, drill a 2mm hole say 5mm down. Force a allen key into drilled hole and rotate the nut off and grease the nut(not the head) before replacing.
11-18-23, 01:49 PM
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11-18-23, 02:06 PM
#55
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Why wouldn't y'all just do this:
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11-18-23, 04:31 PM
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Ahhh! For some reason I was thinking the bar was still in it. That makes perfect sense now...and a solid idea.
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11-19-23, 04:36 PM
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If you spread that bar clamp too far open, the stem is likely to crack and break later.
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11-19-23, 06:46 PM
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11-19-23, 06:57 PM
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That's a one-inch stem. In fact, I keep that riser stem with my tools. I use it on occasion to help round out seat tubes which have been ovalized.
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11-19-23, 07:00 PM
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