Regarding the nut. I had the same problem and spoke to
Mojo, they are very helpful. Due to the thread being slightly damaged, either from the factory
or from me, I retapped the nut and used a die nut on the bolt because I was told that you should be able to spin the nut down freely by hand. Think the threads are M8 and 1mm pitch but that will have to confirmed by a thread gauge.
HTH