The sole use of a tightening jack is to hold flooring strips tight to prevent gaps and to straighten bowed and bent boards for proper installation and a better more professional fit. Find a Tightening Jack for rent from RentAlmostAnything.com. A tightening Jack provides the user with the ability to apply a ton of force and provides the hold necessary to the free installer’s hands for nailing. Tightening Jacks are made with an easy-to-use ergonomic design, and a variety of tightening jacks are available for rent at RentAlmostAnything.com. Visit us at our website and browse through our vast catalog of rental tools and other items and feel like a pro.