Originally Posted by
Miele Man
Some of the older brakes had a barrel adjuster AND a nut under it. the nut could be round with a rubber ring on ity like the Shimano N600 such as these.
Shimano 600 Brakes ? $45 | Toronto Vintage Bikes
Adjusting the cable was done by HOLDING the barrel asdjuster and turning that round nut with the black rubber ring on it.
An image of your brake would be most helpful in seeing what the problem might be.
Cheers
Thanks, but the barrel is in-line, far from brakes or controls, and there is no visible nut.