why not use alcohol to recover that thc, I do it with my clippings and works very well. dry out the clippings, mash em up, put in a jug with 97% or better alcohol and put in the freezer for a few days, shake it every once in awhile too. after those few days, strain with nylons or a coffee filter; go outside and boil the alcohol on an electric hot plate till it evaporates (it gets tricky at the end, don't burn the residue) once boiled off, the greenish tar at the bottom should be scrapped onto wax paper. Let that stiffen and dry out more for a day (you don't have to, but less messy) and finally go smoke the crap out of it.
A little dangerous, but way safer than butane extraction, you might look that up too.