Restoration of the old USSR autotransformer ARB-250

Video about how the Russian autotransformer ARB-250 of 1980 is arranged.
This autotransformer was kept by my relative, she wanted to throw it away, but I decided that it might still be useful to me. Equipment in the USSR was made maintainable. As it turned out, the autotransformer was simply soiled with putty.