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Old 07-19-14, 06:15 PM   #1
epnnf
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loose braze ons?

you know those insert things, typically on the down & seat tube, that you attach your water bottle cage to? (they're called braze ons, but, they're not brazed on. more like rivet type inserts) Anyway, on my beater, they are loose in the frame. The cage is attached securely to the inserts, but the inserts are loose to the frame. What to do?
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Old 07-19-14, 06:30 PM   #2
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They are called "rivnuts" (may be a trade name); searching on "tighten loose rivnut bike " or similar should come up with a variety of techniques for tightening them.
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Old 07-19-14, 07:11 PM   #3
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The thread is the same as most QR skewers, so you can use a skewer, axle (or any tube) and some washers to make a tool to thread through the nut and pull the back end tight much the same way the installation tool does it.

Or you can use a wicking grade of adhesive that expands slightly as it cures to bond it in place.
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Old 07-19-14, 08:16 PM   #4
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Quote:
Originally Posted by FBinNY View Post
The thread is the same as most QR skewers, so you can use a skewer, axle (or any tube) and some washers to make a tool to thread through the nut and pull the back end tight much the same way the installation tool does it.

Or you can use a wicking grade of adhesive that expands slightly as it cures to bond it in place.
Interesting, I've wondered if there's a fix for this. My LeMond 1/2 carbon - 1/2 steel has one bottle "braze on" that is loose. I added a washer between the bottle cage and the frame; it kind of stopped the rattling enough that I forgot about it until reading this thread.
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Old 07-19-14, 08:39 PM   #5
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Park Tool Co. » ParkTool Blog » Water bottle fittings
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Old 07-19-14, 08:39 PM   #6
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Perhaps this will help:

Park Tool Co. » ParkTool Blog » Water bottle fittings
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Old 07-19-14, 09:11 PM   #7
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I hope they are not like mine:

Loose in the frame, but with cage bolts seized in the threads. I'm ok unless I ever want to remove the bottle cage.
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Old 07-19-14, 10:03 PM   #8
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It's a hassle to loosen the frozen bolts then extract the Rivnuts, and not make things worse. Penetrating oil, needle nose pliers, wedging screw driver between the tube and Rivnut, then at some point Dremeling out the mess. I've replaced many and after removal will often do a to the metal cleaning then epoxy the new Rivnut in place. Slap the hand of the owner and they'll not maintain the fitting again. Andy.
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