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Bleed screws are always loose. There should be no point in the bleeding process where you are sucking on the cylinder.
You should always close the bleeder before letting the pedal come up again.
Use a pressure bleed system or a vacuum setup.
You can get grease that is compatible with brake rubbers. You can use that to help a bleed screw not leak if using a vacuum device.
If you can get a helper, the old fashioned 2 person method is as good as any, once partially filled.
One question. Could the bleed screws be loose because they are 3/8 fine and the holes are 10mm x 1mm? Never know with some modern repro stuff.
Mart.