I have something similar, made from the innards of a fire hydrant, home-built and bought off ebay for £30 bacause I costed the materials (new) for a jack press and found it a very expensive project.
I had to make several modifications to the press, as it came without a tommy bar and socket spanner, lipped collecting tray,straining bag, splash guard and hopper. I got it because the previous year I had to hand wring 80 kilos of grapes (crushed) and I couldn't face that again! However, for smaller quantities, handwringing crushed grapes is perfectly ok. This year I had a mere 6kg each of white and black grapes, which, after (foot) crushing, took just a few minutes to wring out the remaining juice by hand.
Of course, you could use a washing machine's spin cycle, with the crushed fruit in a fine mesh bag and the outlet directed to a bucket. This is how it is typically done commercially, as it's the same principal: a centrifuge.
