Good information can be hard to find but here is a link to a presentation done by NZ Super Rugby referee and international AR Nick Briant for the Bay of Plenty Rugby Union Referees.
Bit of mucking around at the start of the video getting things set up so be patient.
Cheers
Assistant Refereeing
https://www.youtube.com/watch?v=8MMYeWMvlT0
Bit of mucking around at the start of the video getting things set up so be patient.
Cheers
Assistant Refereeing
https://www.youtube.com/watch?v=8MMYeWMvlT0