I too am a bit confused on how you can double nut your shackle bolts, but not use a single locknut. If you only have 1/4" of threads to put a nut on ... there's something wrong with the shackle bolt length or the shackle has spread on you. Like I mentioned ... there are other styles of lock nuts that will work maybe better in short thread situations. No matter what you use ... the bolt should be one to two threads past the nut for adequate engagement.
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