This is a great little technique for making very realistic cranefly / Daddy long legs bodies. For just a few Euro you can get one of these simple extended body tools (link below) and with the material from just one vinyl glove make hundreds of bodies. It takes a little practice, but once mastered you will be churning them out. When made correctly, they are filled with air and float like a cork.
Extended body tool link:
https://www.54deanstreet.it/shop/product/54ds-ebtd-extended-body-tool-straight-8290?category=285
Video link for knotting cranefly legs:
https://www.youtube.com/watch?v=rYWSCEGepIs