You can act with a strip of skins as a “bath towel” for accuracy processing of round profiles.
Work with a cork bar
The cork grinding block is usually used on flat surfaces wrap the bar with the skin, fix the part in the vice and, tightly pressing the bar, work on them along the fibers can improve control and increase the pressure if you work with two hands. Use a skin with a granularity of 1 20 i 80.