this is  the  roller  nut  installed   on a  strat  neck.  it  comes  with  shims  to get  proper   height  on both ends.  this solved  all my problems  with    using the tremelo  and   going  out  of tune  comletely..

to install this  way  is easy  enough.. but   it also comes  with  a   instalation saddle    made of  plastic.   that rquires      removal of the  front  piece   of  wood..   that is   obviously  not  necessary as  you can see. and  save   mine  would  have  fit  into  the  slot as  it  was.    it  doesnt  have to be  perfect  because  you can  ajust   scale   length     and  intonaton on each individual saddle..

again this  made    all the  difference   when    staying  in tune  and  using the tremelo.   ive   put   roller  nuts  on just about   every   termelo guitar  i  own.. and  roller  bridges  on the  ones  with   a   gibson  tunamatic     bridge..

yep  the  tremelo  releases  tension.   unless   yours  is  floating  and   you can  go a bit the  other  way. but in general it  releases  it  then coming   back the   strings  stick  in the  nut  a  bit.. some  people solve this  problem  by  opening the  string  groves  a tic.  and    believe  it  or  not   shaving  pencil  lead  in to the  grove  for  lubricant... graphite  you  know..

the  nut  and the  neck width on my strat  is 1 and 5/8  standard  strat neck.

as to the   neck width of  my variax  i couldnt  tell you  i transplanted it  long  ago.   and its  in a box  waiting   for  transplant  now.   into  an epiphone  dot.. never  liked  the feel of the 300.

somewhere  on here  are the  specs  for   the  variax  necks..  even though  the  headstocks are different   im pretty sure  the  neck specs    other than  headstock are the  same  .