It's just a loop of sheet attatched permanently on the main beam against each hull with a triangle of sheet going from your handle of the lever through each loop back to the handle. You tie a knot in the sheet strategically on each side that when you lift the lever above your head the knot goes through the top loop then the weight as you pull on the lever keeps the knot in the loop. A piece of doubled shockcord pulls the end of the lever back up under the tramp when your finished. If you make your own don't underestimate the force on the end of your lever if the fitting is too small and it breaks while trying to right your cat it will go straight through your tramp. The hardest part is getting or making an appropriate fitting for the end of your lever. I stood my broken windsurfer mast in a beer can ( of course ) and filled it with wessystem then put a stainless steel fitting in the end works well. If you can get Ricks system sent over cheap enough I would just buy that it may cost more but its lighter,better looking and saves a lot of effort. I needed mine the next morning so I just made it quick, planned to replace it with a better one but its kept going just looks rough
regards