Near where I live, there are a lot of wild olive trees. With oil being a problem to store for long periods, I decided to build an olive press. It should also work for apples, grapes and other fruit. It was simple to make, I started with a hydraulic jack I found in a garage sale. The press is now finished and ready to use. As soon as I finish testing it, I plan to have it powder coated to keep it from rusting.
My son and I put it together out of scrap materials in his shop. We made a simple metal framework and a removable bucket with a perforated liner. The oil or juice runs out the bottom of the bucket into your container. If you are pressing olives let the crushed olives drains until the oil stops flowing. You can then remove the container of oil. Replace it with a new container and pour water through the bucket. This will get more oil out. The oil will rise to the top of the water and can be easily separated.