Found picture of the Loobman chain oiler I installed on my NC700X. Oil hose leads to the rear chain sprocket. Push button operated and little oil flows on the rear sprocket. At the end of the oil hose is a oil delivery head which 'grips' on both sides of the chain sprocket.
Loobman, made in UK, costs some GBP 30. Oil used Stihll Synth Plus, chainsaw lub oil. Simple and works very well. In use for 4 yrs.
(CRF1000LAD, CRF Rally Red, Zumo390)