A variation of your technique that I use: Stretched sprue - plastic tree held over a small votiv candle and rotated just until it becomes pliable. Then holding it away from the flame gently pull both ends. With a little practice you can control the thickness and lenth. The plastic is much easier to work with , I use fingernail clippers to trim after glueing into a drilled hole. Plus you can hold two parts together and drill through both for perfect alignment. If the pin hole is going to show, leave the pin long and just file the "show" side and it disappears. Note that some plastic tree stretches better than others, just experiment.