It's only available from LeeSpring. Effectively, it's made to spec. You need to buy 10 springs to avoid an administrative charge, but with 2 of you now needing this spring - that's only 5 springs each if you share the costs. You can sell the ones you don't need.
If you like having a functioning servo saver that still affords steering, you'd like the spring I refer to, rest assured.
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The problem with compressing the spring like this to get some steering back, is that there's no longer any saving action left and every knock or tumble risks magic smoke from your servo.
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With the specified LeeSpring, it requires no modification and doesn't need to be clamped down - because it's wound with the correct grade of music wire, has the correct spring rate and is put under just the right amount of compression to allow strong steering - but - will allow enough give if something bad happens.
Yes - it's unfortunate that you need to buy 10 to avoid an administrative charge, but this is because you're buying direct from the manufacturer. They work out much cheaper than typical springs from any of the big RC brands.
Buy 10 springs, sell 9 of them.
It doesn't matter how big and powerful your servo is if your servo saver is all floppy!