You can, of course, brush them, however this will not last long. More radical means of plastic washer embedded between the half-loops.
There is another way to get rid of the squeak. You need to shorten rod one half loop and put the loop inside a steel bearing ball.
Recommend to read
CUT THE TILE
When carrying out cladding work, tiles is often a need to cut from it a narrow strip. To do this, of course, can and glass cutter, but it is difficult, and there is no guarantee that the...
THE TIP IS IN THE TUBE
As you know, carrying sharp objects without case - for example, ski poles, public transport is not permitted. Existing ferrules, no skier no use: they are plastic, from the cold lose...
