When i make hash oil, i use acetone (used mainly as nail polish remover). I've read somewhere (erowid.org i think) the THC is more soluble in it than in isopropyl (or another) alcools. And acetone evaporates much faster too... you dont need heat it, so its a safer method.
I've read you can use butane too, in a process called "honey oil extraction". I never tried it (yet), but think it can be a very good process too.
Personally i love the hash oil! Its much more practical to smoke than weed, cause have almost no smell, the amount needed is much smaller, its healthier to the lungs, can be easily hidden... so... i just love it! :stoned:

Peace, and plenty of weed for all! :jointsmile: