hey try puting a big bolt in fron the size of the folding bolt the one in teh top in the middle on the scooter infront of the neck its works for me and its ezier to do tailwhips!
first of all, get bolts, not axels thingies, cuase they don't go as tight, ans second of all put bearings or washers on each side of mech, too make it tighter, and just tighten the living piss out of it, and make sure its pushed all the way forward when your tightening it.