Anyone tried one of these for the primary chain could make sealing of the chaincase less of an issue
I think something similar has been mentioned before. The possible problem is the higher speed of the primary chain and thus the oil will fling off a little to rapidly.
Looks an interesting device though.
I've just watched the videos and it seems like a great chain oiler but I'm not sure it will work very well inside a primary chaincase. How can you monitor the flow to set it up? And fixing the nozzle to flow on the bottom of the clutch basket could be an almost impossible challenge. I suppose you could just let the oil drip onto the top of the chain tho.
I would think enough oil to do the job is going to make more mess than a leaky case. Drip feed is usually made to bottom run in front of clutch.