Explains Cosmos on Instagram: "The post features a 15-second video tutorial on crafting an adjustable wrench from a bicycle chain and pins, showcasing its ability to grip bolts of varying sizes by stacking chain links for a custom fit. This DIY hack, first popularized in online videos around 2018, recirculated in 2025 via social media, driving the post's rapid 838,000 views and 2,400 likes within hours. Replies highlight similarities to existing tools like crescent or strap wrenches, with users