Before I got actual bubble bags I used to make hash by a similar method, but without the bags/screens.
I've never liked indica bud much. Hash I do like, and once the Thai and Jamaican sativas disappeared from the market where I was living in the mid-late 80s, this got me through the times when there was no hash around. It won't make something as strong as qwiso or bho, but it's easy, clean, and pretty much free. Probably everyone knows this simple method already, but in case someone doesn't...
In its basic form- Using a clear container with a screw-top lid, generally not glass- usually plastic, I would fill it about 1/4- 1/2 full of ice cubes, a bunch of bud/shake,trim (frozen if possible) and then cold water till it was 3/4 full. Shake for a few minutes, strain (t-shirt, strainer, whatever) into another container and let sit for a while, a few hours if you're patient enough. Resin glands sink and form a greyish residue on the bottom. Skim and siphon off the water as much as possible and you can soak up most of the last of it with paper towel. Let the hash dry somewhere warm for a while...
You get the idea. Same process as bubble hash. It won't be as refined, but I made plenty of good hash this way, sometimes in larger batches in five gallon buckets.