Thanks for the kind words, Chris. Yes, I have done quite a few of the types of seats that have the strips of u channel to sew to the covers to refasten. I have been able to sew the originals back on with a #22 size needle and 92 thread. And I use a very narrow foot to do this to try to get back to the original holes. Machine: Juki LU563. An idea what I do sometimes. The principal is, if the plastic strips is sewn to the covers, there is no allowance to adjust the cover if needed. The plastic strip dictates where the cover goes, so one has to make sure it is sewn back on the new cover properly and the patterns are done precise. What I like to do if possible (if possible meaning hardware on the bottom side of the cushion is not in the way, and cushions is what i am mainly talking about and backrest can be more challenging) is to either make the vinyl longer and find some where to hog ring the vinyl or on the flat piece of metal that the plastic fastens to, drill some holes (maybe 1/4") about 4" apart and hog ring the cover to the holes. A principal I use is, I want to fasten that cover the way I want to and I am not concerned how it looks underneath the cover - I am concerned with what the cover looks like that is seen. When looking at a seat, observe it like when it is in the vehicle. That is different when looking at it on the bench.
Rick
Rick