At a surcharge we can splice an eye in your ropes. While a knot reduces the strenght of a rope with 50%, with a splice this is limited to approximately 10%. And it's the weakest link that counts!
Twisted ropes will be spliced conventionally. For woven ropes various methods are used. For instance, a rope with a Dyneema® core gets 95% of it's strenght from the core, while the cover just serves for abrasion resistance. Therefore, a rope with a Dyneema® core needs to be spliced 'core in core'. The easiest way is to splice a bare eye in the rope and take away the cover.
A woven polyester rope however needs the cover to add 30% to it's strenght. No suprise that the cover needs to be incorporated in the splice of the polyester core.