My new house has a swing seat in the garden, only the seat has started to tear and I am afraid I will disappear through it! Googling only seems to show replacement canopies or cushions, but this is the actual canvas seaty bit. It would really gall me to have to replace the whole thing, as the frame is sound: has anybody any good ideas? I am beginner-level with a sewing machine but willing to try, but I'd prefer to just buy something :)