A followup to my post about using VGA cable dust caps for cattle watering troughs … Alan Jones asked what could be done with HDMI cable caps? I use them for lineside relay enclosures next to block signals and grade crossings. The “doors” are just drawn on with a fine tip Sharpie. You may also notice the scratch built block signals resting on bases made from keys popped off a scrap computer keyboard. See the article.