Severne "4 roller tack pulleys" and how to pass rope

[Pacs]

Hello,

I have a Severne Overdrive, it has a 4 pulleys at tack.

By now i used a 2 pulleys extension (and only use 3 of 4 tack pulleys), but i will use a 3 pulleys extension and i want to use all 4 pulleys at tack for easy and effortless trim.

How to pass the rope to use the 4/3 pulleys set instead of older (and clasical) 3/2 pulleys set?

I think i cant pass the rope one by one in order because tack pulleys are at 90 degree from extension pulleys. It can damage sail?

Thanks in advance for the advice.

Paco