Electric motor spacing: Though some garden companies offer this type of tool, its high cost often makes it prohibitive to hobby gardeners. Fortunately, there’s an easier DIY solution many gardeners have begun to adopt.
Cut a long rectangle, about 6 cm by 25 cm of heavy paper or cardstock and fold it lengthwise, so it now measures 3 cm wide. Open it back up and attach a battery-powered razor, electric toothbrush, or similar small tool that vibrates and tape it in place so the handle is in the fold for part of the length of the paper. Place your small seeds in the fold, then turn on the motor for the vibration to slowly shake the seeds down to the end of the fold to the soil.https://www.theseedcollection.com.au/blog/our-blog/how-to-sow-tiny-seeds/