Just in case you need a "gear-like" SVG symbol:
<svg width="5.0" height="2.5" version="1.1" viewBox="0 0 5.0 2.5" xmlns="http://www.w3.org/2000/svg">
<path d="m0 1.25v1.24h2.48v-2.48h2.48v1.25" fill="none" stroke="param(outline)" stroke-width="param(outline-width) 0.2"/>
I am not good at drawing. Modify as required.
Credit should go to JGH for all the ideas and detailed steps provided in the answer to Drawing wavy, wiggly lines in QGIS?.
One additional from me is: Please keep the
marker interval and
equal. (Click on the
Marker line as seen on the picture below to find
interval. In this example
interval are both 4.0 mm.)
- SVG path has to be set correctly (e.g. here).
- SVG symbol
outline width might have been preset to
No outline or
0 (automatic) depending on previous SVG setting, which makes it invisible. Set it to 0.2 mm or any other numbers.