Took some doing this weekend. I've taken car seats apart before and each time I do I learn something. This time was no exception.
Once disassembled, the condition of the old foam was, well, kinda gross:
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I spent quite a while cleaning the seat rails to get the old grease out of them and get them to work better. Cleaning was a big part of every aspect of this job.
I got everything cleaned and ready to go, and discovered that the cushion that I was able to buy new from Toyota was shaped slightly differently than the original.
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Initially I was not happy with the result and spent quite a bit of time trying to shape some foam from the old seat to fill in the differences. BTW, I spent about an hour looking for my hog ring pliers and I ended up using heavy zip ties. I don't thin I ever will try to use hog rings again. Zip ties are much more flexible and easier to boot. And there seems to be a consensus that hog rings don't really have much of an advantage over zip ties.
After a while I gave up trying to augment the new cushion--I don't have a hot knife and the results I was getting were ... not great:
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I was also trying this to try to get more thigh support from the stock seat--which has no adjustment as this is a RHD-to-LHD truck and they did not change the seats. The adjustment knobs are in the passenger seat in this truck.
And after a while I gave up on trying to add to the foam and just went ahead and finished the job.
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And it is much better than it was.
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And more comfortable.
Ultimately, I think I will change out these seats for something more suited to me, but I might wait on that until I bring the truck to the US in a year or so. For now this is 'good enough'.