Double security, locking two nuts together gives more locking force than a nyloc alone .
Or maybe just to make up the space.
I thought the latter. A couple of stainless washers would be a better choice. When it rusts it'll make the whole thing look messy.
@Alexnharvey started
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Double security, locking two nuts together gives more locking force than a nyloc alone .
Or maybe just to make up the space.