The scream aid is the load limiter of choice for marginal placement.Most sceamers activate at too high a force for the best effect on very small gear like RP0. Because the scream aid activates sooner it is more effective at preventing that peice from pulling through. The downside is that overall strength is reduced but on very marginal plaecments that is likely to be irrelevant.

Shock absorbing sling designed to limit peak loads in any climbing situation. When the Screamer activates, the action of the stitch ripping produces a loud tearing sound, indicating the system has reached the activation point of the Screamer(>1.5 kN).

See this page on Yates' website for detailed examples of how screamers can reduce the load to runners and anchors.

Activation >1.5kN. Reduction in system peak loading 1.5-2kN.