By graemo - 8/11/2014 3:39:41 PM
Hi All,
Apparently this is quite a common malfunction, and I've had a good old look around on the interwebs but can't find a sure-fire way of going about fixing it. The rivnut on the downtube on my posh bike has ripped out (through me not greasing the bottle cage bolts....), leaving a largish hole. It's one of those things I've put off trying to resolve for over a year, but I really do need to get it sorted soon!
The hole is larger than a rivnut, so I need to build up a surface for the nut to grip. Ideas I've considered include
Patching the hole from beneath by somehow squeezing in a patch of cf, applying some resin, adding a couple more hole shaped layers of cf and filling until there is no hole to speak of. Then drilling and inserting a new rivnut
or
Inserting a pre-squashed rivnut and building up the sides of the hole with epoxy filler/resin. This seems more of a bodge and I'd worry about it not being a permanent repair.
or
Sending the frame off to a cf repairer who knows what they're doing?
Thanks!
PS Sorry for the large picture!
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By graemo - 8/12/2014 2:37:06 PM
That's great. I think I was worried about the resale value, but at the end of the day a larger insert isn't really going to spoil the looks as it will be hidden by a bottle cage. Measurements indicate I should get away with an M8 rivnut (with a squidge of filler).
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