Factor O2 Assembly Manual page 9

Install barstem
Note: Carefully consider all possibilities before cutting your
fork. Do not cut if you can foresee any reason to raise your
stem position in the future. When you are 100% sure, carefully
proceed as any error in cutting too short will require replacing
the fork. The fork must be removed from the bicycle before
cutting.
With a marker, make a line on the steerer tube just above the
top of the stem. (if using an aftermarket stem we recommend
using a 5mm spacer above the stem) and remove the fork.
Install fork in fork cutting guide and carefully line 4mm below
your previous mark with the cutting slot of the guide.
3-7
4-1
Cutting the fork
Cut fork steerer tube (there are many blades specifically for
cutting carbon tubes. If none are available, a 32t Bi Metal
blade will work).
4-2
Carefully remove any bulges
or rough edges from the top of
the steerer tube with a flat file
and sandpaper.
Fully insert the compression
plug into the steerer fork tube
and tighten to 8 Nm.
Note:
to 3-7 of installing the
headset
Assembly Manual
4-3
Repeat steps 3-1
06