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
FIND “THE FOX”
In the early 30-ies of the radio Amateurs of the Soviet Union, mastering of ultrashort waves, for the first time faced the necessity of direction finding of radio transmitters. The...
A PLACE TO START
This house (Fig.1) with an area of 17 m2 consists of one room (see Fig.2) and may serve as a temporary shelter during the development of new suburban area. It is designed for four people...
