I loaned the book to a friend of my sons let me think
The larger resin glands are about 70 microns the smallest about 140 microns so best results are with a 70-80 micron screen. that is for the first seiving(best quality) the same raw material can be reseived for a 2nd or 3rd time but the quality decreases as more vegatable material is forced through.
I will make either water or seived hash but I do not combine the two, too easy to get mold from the water hash.
Aging, only works on the raw material the purpose of aging is to breakdown the clorophil and reduce the "Hay" flavor once it has been pressed hash can be preserved for a while (1-2 years) but the thc degrades in heat and oxygen.
Bubble bags make great hash but you need a great deal of material to make it work. I save ALL the trimmings for the bubble bags and even the smaller buds, but it has to be DRY before you can extract a deecent return. DRY as in TOO dry to smoke, dry like crumble to dust dry. Then I freeze it before I add it to the ice water. Cold keeps the resin glands intact once they start to melt and bond they will grab every piece of green and the hash quality goes down very quickly.
I don't know about silk screens we have some here but I keep using my industrial screens. Of course I have to chill them before use but that is just part of the process.
properly done water hash (bubble bags) can produce a 70% THC product that is better by leaps and bounds than any other method. Except possibly hand rubbing. But with hand rubbing you need acres of herb and very strong hands. But hand rubbed hash.... memories of tibet.... where's that chillum...
Doctor G