Here  is  a  filing  tip  from  @crazyhorseclassics  -  βI  frequently  use  negative  space  in  my  work,  which  requires  a  lot  filing  90*  corners  and  squaring  off  sawblade  marks.  
I  use  a  vise  as  a  steady  third  hand  to  keep  the  metal  fixtured.  It  reduces  file  chatter  and  keeps  my  horizon  line  consistent.  Having  two  hands  greatly  improves  efficiency!)
I  also  recommend  using  cardboard  or  leather  to  help  keep  the  vise  marks  to  a  minimum~
Donβt  get  crosseyed!  ππ€π½β  love  this!  Thank  you  for  allowing  me  to  share!  #filingsilver  #ailingtips  #filingjewelry  #metalsmithtios  #benchvise