This article is from the Recreational Figure Skating FAQ, by Karen Bryden with numerous contributions by others.
Skates with improperly mounted blades can be virtually impossible to
skate on. The blade must be correctly positioned and aligned on the
boot. To avoid twisting the blade, the boot heel and sole contours
must match the blade mounting surfaces. If not, the surfaces can be
trimmed with a rasp, or shims can be added between the blade and boot.
Briefly, this is how your skate shop will mount the blades:
1)find the center of the tip of the sole and the center of the heel
and draw a line joining them.
2) place the front of the sole plate of the skate blade in line of the
front of the sole of the boot, and maintain the skate blade along the
line drawn. This will place the blade between the big toe and first
3) Screws may be placed only in the slotted holes, so that you can try
them and make minor adjustments (a blade position slightly closer to
the big toe is sometimes favored). Don't do any jumps until the best
position of the blades has been found and more screws have been