With the seat upside down, press down on the frame while pulling up on the attaching sleeve in the center of the front... hobring it- and work outwards from the center to each corner.
as you go around the corner work the vinyl upwards from the top of the seat toward the lower edge (the seat is upside down- you are really working/pulling the vinyl downwards and to the rear).
If you have bad ripples along the welt/seam you may have the seam itself folded multiple directions inside causing the ripple. you may need to get your fingers way up in there to push/pull it so that its facing the same direction (either up or down) along the whole length.
contiue hogringing the sides until you reach the back.
With the seat flipped over, you can work the vinyl with your hands- push it to create a ripple and push it towards the edge of the bun until the ripple goes over. Then repeat.
take care not to pull the cover too hard in one spot- instead push the entire panels leading to the spot you want to pull... that will help to stretch the vinyl w/o causing a weak point that can rip.
In this cushion the LH side (facing you) had a lot of issues (as seen in that first shot) here in this last one its nearly worked out.
Some heat from a steamer should help it to relax and further flatten out.
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