The Seat Squab.
The squab is a bit more complicated, but the principle is the same.
On this, the plastic channelling is hooked over the metal frame. Turn the squab over and the front fixing looks like this.
You can remove the two metal clips with a screwdriver.
Kneeling on the base, compresses the foam and allows you to begin easing the plastic channeling off the frame.
Once you have the front unclipped, there is length of plastic channel on each side that unclips quite easily.
Now we need to release the back of the the cover.
Now, turn the squab around so that you can begin to roll the front of the seat cover up off the foam.
You will encounter your first barrier now i.e. the cover is attached to the foam with hog rings.(so called because they are swines to get off and on). The first two are in the channels between the seat and the bolsters.
Using long nosed pliers, rotate the metal ring until you can see the join. Twist the pliers to open up the ring and remove it. Remove the ring on the other side.
Continuing to roll the cover back, you will see a cross bar(yellow) held with three hog rings.
Remove these 3 hog rings in the same way.
Further back, you will encounter 2 more rings in the bolster channels and another yellow cross bar(3 rings). Remove these 5 rings.
You should now have something like this.
Feed the heat pad in between the cover and the foam
Make sure the cable is on the tunnel side, and ensure the pad is not creased and correctly positioned at the rear
and the front
-before removing the protective film from the rear adhesive, and then smooth the cover onto the pad.
Refix the rear of the cover.
Turn the squab back around to fix the front. Use small cable ties to replace the hog rings (much easier to fit).
Fit each one loosely until you have all 3 in place and then tighten them, clip off the excess, then push the block of the cable tie round so they won't stick into the cover. Now replace the two in the bolster channels in the same manner.
Repeat this procedure with the next crossbar and final two bolster attachments. Clipping off the excess and pushing the block round out of sight.
With the cover properly attached, remove the protective film from the last adhesive patch and pull the cover over the end of the foam, pushing down to stick the adhesive to the seat, ensuring that the cable comes out via the bolster channel.
Refit the two plastic side channels, and then the front channel. Again kneeling on the back of the seat makes this easier. Replace the metal clips either side of the front channel.
This is the squab completed. Repeat this for the other seat.