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Fender rivet

Old 11-29-20, 01:54 PM
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gthomson
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Fender rivet

More of a mechanical question but on my vintage bike so hoping you guys can help. I recently added fenders to a bike of mine, utilitarian black ones with the rubber mud flap at the bottom. I bought them used and the rear flap was cracked and eventually got caught on something and ripped off. The rivet that held it is still in the fender and rattles when I ride.

Any pointers on how to get this out without damaging the fender?
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Old 11-29-20, 02:06 PM
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Is there enough material exposed that you can grab and crush part of the rivet with pliers so that the remainder slips through the hole? If not, then I'd drill it out.
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Old 11-29-20, 02:10 PM
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...if it's an aluminum or copper rivet, and it's rattling, there's an excellent chance you can simply cut it between the peened end of the rivet and the fender with a diagonal cutting plier. Anyway, that's how I start. If it won't pop out after that, you can try crushing the remains with a plier, or just punching it out of the hole with a pin punch and a hammer. You need some kind of brace on the other side, with a negative space to receive the rivet remains.
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Old 11-29-20, 02:48 PM
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Mount a drill bit pointing upwards in something. Place the bottom of the rivet on the upward-pointing bit. Drill from the other side (you may have to grind a flat on one or both bit points); or if that surface is concave (likely with fenders) just file the outer portion away, using the bottom drill to keep it from spinning as you file.
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Old 11-29-20, 03:56 PM
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When I push it outwards either side, there's barely a mm gap so I would need really thin but strong clips. I have tin cutter snips but they were too big. On the inside of the fender is the bigger end which I can try and crush with pliers and see if I can then pull through the other side.

If that doesn't work then I'll try the drill bit to file it down, thanks
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Old 11-29-20, 04:13 PM
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How much time and money you spend on this is up to you, but I would just put a dab of clear silicone or plain old tub & tile caulk on the inside - no rattle.
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Old 11-29-20, 04:47 PM
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^^Good idea! But if you want to replace the mud flap like my set of PB fenders, I took a cutting wheel on a Drexel to the back side. Then it just fell out. The hole is small. Punching will crack the fender area.
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Old 11-29-20, 05:21 PM
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Originally Posted by FBOATSB
How much time and money you spend on this is up to you, but I would just put a dab of clear silicone or plain old tub & tile caulk on the inside - no rattle.
LOL I think that might be the simplest idea and I'm all about keeping it simple (KISS principle). No risk and no special tools required.
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Old 11-29-20, 05:26 PM
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Originally Posted by gthomson
LOL I think that might be the simplest idea and I'm all about keeping it simple (KISS principle). No risk and no special tools required.
If you ever feel like adding a mudflap later down the road, of course, you can deal with it then.
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Old 11-29-20, 06:12 PM
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but I would just put a dab of clear silicone or plain old tub & tile caulk on the inside - no rattle.
Been there and done that. Actually, the silicone trick works for just about any fender rattle.

The other solution would be to snug up the rivet. Put another way, rivet the rivet again with a bit of gentle hammering while keeping the head of the rivet on an anvil of some sort. This method plugs up the hole that would otherwise be empty. Not sure if that means anything.
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Old 11-29-20, 07:24 PM
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Originally Posted by randyjawa
Been there and done that. Actually, the silicone trick works for just about any fender rattle.

The other solution would be to snug up the rivet. Put another way, rivet the rivet again with a bit of gentle hammering while keeping the head of the rivet on an anvil of some sort. This method plugs up the hole that would otherwise be empty. Not sure if that means anything.
Yup got it and then I don't have to worry about an empty hole in the fender. This will be plan B in the event the silicone doesn't hold for whatever reason.
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Old 11-29-20, 07:51 PM
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You may be able to grab one side of the rivet with a pair of vise grips with new, sharp teeth, then drill from the other side. I then use screws, nuts and lockwashers (for an easier job when that flap needs replacing).
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