i have made a rather good dart. works well at close range not sure on accuracy never tested it properly. 110mm piece of 12mm dowel with a hole drilled half way down the middle and a piece of 0.5mm metal rod sharpened at both ends hammered into the hole as long as you want. then wrap masking tape aro...

i was wondering if i blow on one end of my sprinkler valve should air come out the other end. I'm not to sure how they work and i wasn't sure if it needs pressure to seal.