Bicycle Mechanics - My rim sounds like it has a BB in it

I have an old 28" Dunlop (Westwood style) rim that sounds like it has a bb rolling around one of the outer lips. Obviously there's some kind of debris floating around in there. Is there any way to get rid of it? These rims are such a pain in the rear to find, so if there's a way to fix it, I'd really like to give it a shot.

I would try taking off tire , rim strip and running a little foam spray between a spoke hole to catch what might be some off the pinning material which has brke loose over time , pick it up @ home depot just make sure you are near the material as it will expand quickly , my two cents

If you can get access to the inside of the rim, then it's not usually too hard to get whatever it is to fall out. I've got the same thing on my mountain wheels, but they are currently sealed for tubeless, and I'm too lazy to take everything apart.

1. Take off the tire and tube.
2. Hold the rim with the valve hole at the bottom and shake the wheel until the nipple or whatever is rattling falls to the bottom.
3. Carefully flip the wheel to horizontal and try to fish whatever it is out the valve hole.

The wheel is unlaced and has no tire. There is no hollow space where the valve hole is,. These rims are rod brake style Westwoods.

Whatever's inside is rolling around one of the tire bead edges and there are no openings or cracks on either side. I wire wheeled the entire inside circumference of the wheel and checked it out with a fine tooth comb. My guess is it was a piece of slag broke off from where the seam was welded.

May I suggest lithotripsy (http://en.wikipedia.org/wiki/Extracorporeal_shock_wave_lithotripsy)?

Lmao

Any way you could magnetize it so the piece sticks and stays put?

How slow you planning on going for it to make noise?It won't move once you get rolling....