@Bogleg if I remember correctly that is partly how this topic got started. There is another thread about DIY vape juice that I will try to link. But in that thread it was brought up that vape juice is made best with a “purer” concentrate than just flower. Meaning getting as much plant matter out, that morphed into how to get a concentrate in a safe manner without harsh chemicals or potentially blowing up your house (ie: bubble hash), and voila this thread.
There is a video too on using the PG/VG which I have done and is not hard.