Pre-filled cartridge clogged to the point of the oil coming through the mouthpiece?

https://imgur.com/a/5ulDcH2 For the first 60% of this cart (E-Glu) and another I've had, it worked fine and smooth, but after a while it takes forever to coax it to unclog and by the time it works the oil is nearly coming through the mouthpiece into my mouth! I've tried a variety of wattages, screwed it in different amounts, different pull strengths, but none have been helpful.

Read about using a hairdryer since the oil is thick or separating the metal cylinder on the bottom with a pin for better connection but I'm too afraid of breaking it. Any help is appreciated.