Help Teleport rope particles to wordspace positions in runtime

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I have tried rope.TeleportParticle(index, position) where position is world space without any success (teleport to random postiion).
does anyone know how if there is a easy way to turn position into local space easily?

Idealy I wish to Teleport a particle to a world space position then lock its position by dynamically creating a Attachment for it.
Can some one help?