To hot knife oil, if its too runny stick it in the freezer, put some on a pin, heat your knives, then take the toke.
A paperclip or thin metal device is ideal for handling oil. Get the glob of oil on it, then heat the metal with a lighter and the oil will run off the metal onto the bowl, jar, whatever you want.
When taking hash oil hits off something like a pipe or bong, putting the fine hash or oil right on the screen I find tends to be wasteful. Putting it on a thin bed of weed, or even some hash is great, the hash/oil will melt and instead of going through the screen it will stay in the bowl on top of you weed/ash in the bowl so you can smoke it all. I generally either put a bowl of weed or crystal into my bubbler or gbong and either top it with the oil or smoke it first then put the oil on the ash. Gravity bong is my preference because you can brew huge tokes, and I find it to be efficient.
Also mixing a pile of crystal and oil makes a nice little hash that is easier to work with, and gets your pwnt.
- 9mmCensor