How to thread ?Streamline? Pulley
Start with thread down => for my old ?homegrown? extension this means pulley on the right
Thread up to sail pulley closest to mast ? up the bottom and out the top
Obviously thread up on that pulley
Thread down middle extension pulley ? at the mast side - from inside out
Thread up outside that extension pulley ? obviously
Thread to outside sail pulley @ the top side - top down
From top of sail pulley to outside of bottom extension pulley. - outside in
Now up to middle sail pulley from bottom up
And lastly up through the cleat .
Ideally there is NO crossover of lines...
There may be some slight crossover on this extension since the start of the cord should actually be up higher?.
If your mast base has the "wheels" in the other orientation, it is a simple back n forth - with NO crossover of lines...