this cant work on 140s

Body mechanics on this is horrible.

Hiya, I've had to take a wheel off which involved cutting through a piece of plastic on the wheel to reveal the spring /pin beneath, since doing this I can't get it back on, it won't click back in! Do I need to buy a new wheel or could something be wedged in to hold it in place? Thanks!

American carts have bigger wheels. They're much easier to pull on dirt/gravel and particularly grass. Also, it's not that hard to carry all that stuff. You shouldn't have to use it like a dolly.