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
BRUSH-IMPROMPTU
So it is sometimes: you need something urgently to paint or draw, label, and doesn't brush. Rescue method, which is applicable for manufacturing of any brush set. This will require a...
CORKSCREW TO THE SHOVEL
This happens often in adults, not for kids: try hitting the earth or stone to knock down accumulated layers of soil and break the shaft. And to pull the chip is harder than a turnip in...
