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An unpowered servo needs very little pressure to return it to neutral.
therefore a biro spring is perfect. If you have not tried it then you just do not understand how it works.
It is the easiest and cheapest and most reliable method of stopping a runaway in the case of a broken battery or power lead.
I would again disagree. My JR8711 is one tough servo to turn dead. Also again, if anything were to go wrong with the servo and it froze open I want to hit the off button or turn my radio off and know it will stop. i think we all know what your talking about and most of us tried it when there was no alternative but, technology has advanced and I will put my $2000 and up investment on the new technology on this one...