One at a time, I took just enough tension off e then a & took one of my small round files and just barely ran it across the top facing the scroll & the bottom towards the tailpiece (like you said) just to make sure it was smooth so the winding wont catch then before replacing the strings in their notches I put a decent amount of pencil graphite. I dont have calipers to get exact so I didn't even try to reshape I just barely smoothed them out.