Quick fix: Thread a blunt tapestry needle (no extra yarn) and ease the slack from the loose stitches at the join point sideways into the neighbouring stitches on both sides.
What you are seeing
A vertical column of looser stitches at each needle join — a visible gap running up the sock, sleeve, or hat. The column looks stretched and open compared to the surrounding fabric, and appears at every point where one DPN meets the next.
Why it happens
- Tension naturally relaxes when picking up a new needle — your hand must re-grip, causing a brief moment of looseness.
- The yarn travels a slightly longer path across the gap at each join.
- Any hesitation or pause at the needle change compounds the slack.
Fix it now
- Identify which columns are laddered — typically one per needle join.
- Thread a blunt tapestry needle with no yarn.
- Insert through the first loose stitch at the bottom of the ladder column and ease the slack sideways into the neighbouring stitch.
- Move up the column stitch by stitch, easing slack gradually — a little from each stitch rather than all from one.
- Work both sides of the column, distributing slack left and right.
- Wet block the finished piece to let the fibres settle evenly.
Prevent it next time
- Knit the first 2 stitches of each needle slightly tighter — hold the yarn with a little extra tension as you begin the new needle.
- Rotate the join: knit 1-2 stitches past each needle join before rearranging the work. This prevents any single column accumulating all the slack.
- Avoid pausing mid-join — complete the first 2 stitches before putting the work down.