Re: 'The (almost) everything was not right bike'
I ditched the chain spring tensioner setup long ago, it was more problems than it was worth, just using the stock tensioner mounted with inner tube to not move.
Bent tensioner to align with chain.
And bought a quality KMC 415HD bmx chain.
A lot of hassle behind me.
KISS principle here.
I love my Motor Bicycle, I love Beer, I'll try not to like them both at once.