Not 100% positive but that looks like a threaded rod screwed into the eyelet. Try turning it out. If it comes out go to a industrial supply store and purchase a threaded rod grade 5 or grade 8. Cut to length use
"lock-Tight" when installing the threaded rod into the eyelet. You now have manufactured your own tensioner. Hope this helps
06 Holiday Rambler Ambassador
2016 Ford Explorer twin turbo