Install onto the the steer tube of the fork a stem spacer of your choice, or none at all, depending on your height preference. Slide the stem onto the steer tube and check for steer tube installation depth into or out of the stem. The first photo below shows spacing that places the stem too high. This causes the steer tube to fall too low below the stem top compromising strength and safety. The second photo shows the stem installed with a shorter stem spacer allowing the steer tube to extend beyond the stem top. This will provide a secure clamp of the stem around the entire length it is in contact with the steer tube.