Night Salomon Backslide Plate Mounting Instructions.
Here is what you will need.
The first thing to do is get the backslide plate and boot to fit together. This is pretty simple, just removing material in the right places. A bench grinder is the best way to do this, but a Dremel tool with an appropriate grinding/sanding bit can be used too.
1. To begin, you will need to remove everything from the bottom of your boots.
Here we see the bottom of the shell, stripped of parts. The "ridge" we need
to grind flat has been marked with a marker. It has already been modified to
accept the Night souls, which should be done BEFORE mounting the backslides;
but you can grind this "ridge" flat while mounting the souls, if you want to
save some time. 
2. Here is a side view. Again, the area to be grinded flat has been roughly
marked. 
3. Here is a shot of the "ridge" being grinded flat with a bench grinder. You
only want to make it even with the flat middle area of the boot- no deeper.
It should be one flat plane when you're done. 
4. Another view of the ridge being grinded flat with the bench grinder. 
5. Here we see the classic Razors backslide. In order to fit it between the
Night plates, we need to shave the little lip off of the front, marked here
with black marker. This is for sizes 250 & 270; smaller sizes will also need
to trim some material off the back of the plate (by the screw hole) in a similar
fashion. 
6. Here is a view of the front lip being grinded off of the backslide. 
7. Here is the backslide plate with the lip grinded off. 
8. Now re-mount your Night souls to your boots. See how the backslide plate
fits nicely between the front and rear souls? You want a snug fit. Again, on
smaller sizes, you will need to grind down the back of the backslide as well
(the part touching the rear soul plate in this photo). 
9. Here we can see that the backslide doesn't sit flat against the bottom of
the boot. We need to remove the "hump" in the middle of the backslide plate
so it will sit nice and flat against the boot. 
10. Here, the "hump" has been marked to show what needs to be removed in order
for the plate to sit flat against the bottom of the boot. 
11. Here is a view of the "hump" being grinded off with the bench grinder.
Be very careful, hold the plate securely- it can easily catch on the wheel and
fly away if you're not holding it securely. 