BHO isn't an electric conductor but could be aggressive like tree gum/resin especially when hot I think. I hope your nose is tricking you... But after what you are saying sounds like unhealty smell! Just be careful. I would try to open it up and clean like Vitolo said.
@Ratchett
Aren't you are manufacture of loading funnels and gongs, songs and so on?
I think you could do a bowl size reducer very simply of Teflon or ceramic or another heat resistant Polymere like
@olivianewtonjohn's picture suggested (if I understood it right).
Teflon should be the easiest and fastest way to process, just 2 working steps (cutting and drilling) from a pole of the right diameter to the reducer!
Just throw one of the disks in the right size in the solid/easy valve...
Edit: or just throw a stainless steel cylinder in the middle of the bowl like olivianewtonjohns picture could suggest, too.... But this should affect heat transfer I guess