a compression tool suited for aiding the installation of gas cylinders , especially for the underside of fold - and - roll tables . the tool comprises a generally c - shaped clamp subassembly having a lower jaw , an upper jaw , and an arm . a spindle is connected through the upper jaw , the spindle having a spindle lower end . an upper channel member , preferably u - shaped , is connected to the spindle lower end , the upper channel member configured to travel axially along the spindle and engage a first eyelet of a gas cylinder . a lower channel member , also preferably u - shaped , is connected to an outer end of the lower jaw in alignment with the upper channel member , the lower channel member configured to engage an opposing , second eyelet of the gas cylinder , wherein the gas cylinder is compressed and secured within the clamp subassembly and immobilized for installation .