If your neck is not latching into position before twisting the bolt to fully tighten, first try the instructions here to make sure you’re pressing the neck properly into place against the body: https://journeyinstruments.com/journey-overhead-assembly-instructions/

If the latch catch is not attaching to the neck mechanism, use a pair of needle-nose pliers to bend the latch catch in the neck closer towards the center of the hole that houses the neck latch catch. Do this by 1mm increments so as not to over-bend the latch catch. See picture below: