Vinyl Repair

I haven't repaired much vinyl in years but with the current school holidays I've worked on 2 school mini buses these past 2 weeks and some car seats. A customer brought this seat in today. It's a common design fault with some models and this repair was larger than I would normally choose to do, but I can't seem to turn down challenges. It's not an "invisible" result but is structurally strong. It's like going back 30 years when vinyl was more common!