Rope cursor with attachments

[Balou]

Hi,
Using Obi 6.3. 
Here is my setup:
3--2-----1

1,2,3 are attachment on the rope.
I'm trying to extend or rewind the rope at these two position
3--2>-----<1 where > < can be < > (cursor direction), meaning rope can extend from the two points or rewind from the two.
It works fine with the one next to 1 (the start of the rope, cursor is at 0, source at .5
But if I try to place the cursor next to the 2, something like cursor at .3 and source still at .5 it behave differently, no particle are added to the rope at this position.

Is there something I should know about cursor and attachments?
Edit: IF I understand correctly one of the issue is, when the cursor is at .75 and the rope is getting bigger, the cursor move, so I need to find a way to dynamically set it to one particle...
Thanks a lot,

[josemendez]

It works fine with the one next to 1 (the start of the rope, cursor is at 0, source at .5
But if I try to place the cursor next to the 2, something like cursor at .3 and source still at .5 it behave differently, no particle are added to the rope at this position.

Is there something I should know about cursor and attachments?

Cursors will stop adding new particles because A) the rope blueprint is out of pooled particles or B) the source mu coordinate is placed at an attached particle, meaning new particles added by the cursor will also be attached and may look like no new particles are being added.

Edit: IF I understand correctly one of the issue is, when the cursor is at .75 and the rope is getting bigger, the cursor move, so I need to find a way to dynamically set it to one particle...

Correct, changing the length of the rope using one cursor will move cursors ahead of it.

kind regards,