I found this video while searching on Google...Thought it might be helpful for some.
barberland video
barberland video
I do it ATG in my video starting around 6:01. The video was made in March and I do the sliding stroke a lot more now because I've been practicing.7 mins in was quite disconcerting, the sliding stroke consistently, it's not something you would do atg
It's a great video... I learned to do a sliding stroke from that. It's been posted before but deserves to be resurrected again.