This is a replacement part for the Fit Stick (all versions)
This sliding plate moves along the level to rest on the top of the saddle. The height can be measured from the BB or Pedal Spindle. This tool uses friction to hold the height measurement.
Note that due to variation in the profile of the aluminum base level, the slider feet may be either too sticky and not move freely, or too loose and not exhibit enough friction hold. There are some ways to remedy these issues, so contact us if this is your situation.