Tried a small screw one a few years back, to make any real progress the apples needed to be fairly well pulped first, I used a clean almost new garden shredder but the juice will not do any aluminium parts any good if it is not rinsed off. It wasn't worth doing really . The press is in the back of one of the sheds somewhere, if I was really interested in doing it a larger one would make it worthwhile for not much more effort but as it is there are a couple of local producers around here and it's easier to get some from them as required.
Chap I work with freezes them whole and then presses them, it seems to work fine but his son operates the press and screws it down far more than I could.
The ice crystals rupture the cell walls which makes them crush more easily .
Despite working with trees I still don't manage to get many usable apples of my tree as it suffers from codling moth and brown rot/blossom wilt such that the fruit all falls prematurely .
I'm tempted to pull the blossoms off for a couple of years to see if I can break the cycle of infestation.
I don't know if this works (a gardener in the pub told me, so good provenance!): in Autumn, rake up all the leaves water the area under and around the tree with diluted Jeyes Fluid; repeat about the time that blossom starts to form use a physical barrier of grease trap on the trunk.
Not sure if Jeyes is still available - seems too useful to be permitted nowadays.
My local ironmonger stocks jeyes Fluid. I suppose the real question is whether or not it is real Jeyes Fluid or whether it has gone the way of Nitromoors, etc.
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