Hi Paul, and a warm welcome to the forum. We all love to learn new things and tinker here.
Congrats on finding an ATCO, they are a fine piece of British engineering and very robust machines.
As grumpy has said, photos of your machine will really help, but in the meantime, your mower should have a data plate or sticker affixed with its model number, serial no printed on it.
Also the engine may have some numbers or manufacturers name embossed....Could you please post those details here, as it will help in identification of your particular model.
We may be able to track down a user manual and parts list as well, with some luck.
Once again Paul,
