Hope this an appropriate forum for my question. I recently bought on eBay a very nice frame made of Reynolds 653 tubing. Problem: something (probably a small piece of metal) is loose and rolling around in the top tube.
The joints between the top tube and the headset, and with the seatpost are entirely sealed: that is, there's no opening that would allow me to shake out this piece of metal.
So, my question is, what can I do about this? What might be safe and what might damage the frame's integrity?