step one, take the MX/SX apart, exposing this:

step two, find the fuse location:
in the image we see the main board of an EMX-1 (THIS ALL APPLIES TO the ESX-1 as well)
there are 8 capacitors that are all same size- silver with a blue outer ring and a slash, drawn in pen.
something like this-
.. O
.OOOO
.. OOO
now then,
there is a single, smaller capacitor that is below these 8 larger ones
.. O
.OOOO
.. OOO
......o <ok...right there!
now, to the left of and directly next to this smaller one, is where the fuse lives
looky there, it says 'fuse1' right on the circut board.
final step: install fuse . use a 1.5A chip fuse (surface mount)
or bypass the fuse altogether!
in the image displayed you can see 2 gobs of solder where a wire was installed, to bypass where a fuse once lived. yes- no fuse in my MX!
it's been like that for over 3 years used (and abused) everyday, traveled on many flights (not carry on) played in the the direct sun many times and just generally put to the test.
but, you may not want to risk that, if not just put in a 1.5er