The inside the holes in my frame are looking a bit manky so I have bought some cheap plastic bungs off ebay for a quick fix. I think they are OK for 8 quid delivered. Before and after pics.
Do your caps fit into standard bicycle handle bars? If they do, you can easily find carbon fibre for bicycles for a couple of bucks too. Thats what I did as I thought £70 was expensive for a few aluminium disks!
