Hello Mike & Nick
I found out that the Easiest way to Place my new John Deere 318- seat cushion repair Kit, was to spray some 3-M Medium Strength adhesive on the Base and back Portion of the metal Tractor seat Pan. By doing this, it keep's the Heavily Padded seat cushion where it need's to be as one start's Placing the ribbed welting along the Outer edge of the metal seat pan that they supply with these seat cushion Repair Kit's. I did Not use any adhesive Nor glue on the ribbed welting piece it self. The welting is snug enough fitting, that it hold's in Place very well to the metal seat pan edge area when Placing it.I Pulled down the seat cushion until I had the edge of the Pebble grain design of the vinyl cushion right on the metal set pan very edge. The cushion will have some smooth Vinyl material toward's the Outer edge of the seat cushion, where it Transition's into The Pebble grain design of the cushion. I found so long as I Pulled down the cushion Vinyl and followed up with the ribbed welting Keeping the Pebble grain design of the seat cushion it went on smooth and pretty easy, Not Puckering if you go slow ane even with the Vinyl material of the seat cushion.
Once you get the new welting in Place all the way around the seat cushion and metal seat Pan there will be some Excess Vinyl material on the back side of the welting. I simply Cut off that Excess Vinyl using a Carpet Knife holding it Very close to the Inner Portion of the new welting that was Installed. You will More than Likely have to cut off the Excess welting when you bring the Two end's together meeting each other as they are Intended to do being dead center of the front Bottom area of the Tractor's metal seat pan. Once I brought the Two welting end's together, I simply Sniped off the Excess welting with a Pair of Dike's and Placed the Coupler clamp and then squeezed it together Tightly with a Pair of Gas Pliers completing the Job. I Guess that it took me about an Hour to get this Seat cushion repair Kit Installed on my 1983 John Deere 318 But it really Made the Complete Tractor restoration Project Pop, finishing it off with a brand new seat cushion. I Hope this help's, Kurt