I've recently obtained a Dolan alley frame, its got an inch carbon steerer. I`ve tried 2 different carbon bungs, but the adjusting bolt that pre loads the bearing keeps coming loose after 10 miles, the bung part stays tight inside the steerer though!!
I emailed Dolan 5 days ago, but as yet no replies. I`ve got an 1-1/8 carbon steerer on my other bike, and have done thousands of miles without any problem's!
The bungs are as rare as rocking horse poo, so to try and get hold of a 3rd will be difficult.
Any ideas will be gratefully appreciated.