back self massage tool

update on my back pain! problem solved with this tool:new triggered one. This really took my pain away! https://makerworld.com/en/models/682706#profileId-611282However there are 2 different tools that works also on diferent spots… couldn't help my self with the pain on my upper back.didn't have a helping hand so decided to design and print a tool.the best trick is to pull instead of push to work ok when you are alone.Another method i tried successfully was the wall while holding it from