i used to have a nice thin glass tube. i flared out the end slightly, to make a little cone...
then i would break off a little piece of hookah charcoal and light it sitting on my saucer. then i would dip my paperclip into the jar of hashoil, securing a glob the tip, and position the glob just over the glowing charcoal and the flared end of the glass tube just above that.
you can guess what happens next. i would load hits for other people and hold the clip and saucer for them if they wished. just, "start on 3- ok, 1, 2, 3... suck steadily!" i'd often make the hit just a little too big... that's the price you pay for not holding the paperclip! (you ever have your friend jam the carb of your bong a second while you were about to clear it?)
it's not my everyday technique (unless i ran out of weed and had nothing but jars of oil left which *has* happened before.) but it is what i would bust out to impress company. i once made hash oil which came out rock solid at RT (and full melt under flame of course), using nothing but glass jars, 2 funnels, a bag of cotton balls, couple bottles of everclear, a stove, a car battery, and a cpu fan. it had to be lifted from the glass-pane with a scalding razor-blade. after collecting, it sparkled with a thousand facets, like a gem. which could not be chipped at RT without the fragment flying wildly through the air.
in the old days once my friend turned me on to smoking thc oil (which he vacuum fractionated after butane extracting, the fanatic) from inside the narrow tip of a pasteur pipette heated by propane torch. that works too, and the pipettes cost 10 cents each (or are free if you work in a lab).