@safri, yes I also use inside sliding parallels and it works, however in all the course material it was not mentioned. I think he has mentioned outside sliding parallel only. In this particular case OIL the bigger pivot is not visible on the chart so it looked different. Thanks for posting another nice example of depicting, how to use it.
@praveen.bhatiya, Andrews original writings doesn't mention about inside sliding parallel but only outside sliding parallel.
Regarding bigger pivot on OIL, I used the highest secondary pivot of P2-P3 move of ML set. It isn't a regular way of drawing inside sliding parallel. But it works more often than not for me. :)