I finally found the root of all my BB problems. The BB bolt is usually too slack and usually comes out more as you ride. So I normally just use more force to tighten it and that just messes up the BB over time.

So using this way i broke one World Cat BB and then bought a TrialTech BB which is very smooth and ride really sweet. But the same thing happened and I eventually broke the spacer on the drive side.

It truns out that all I needed was some thread locker (Loactite or Permatex) on the BB bolt the first time before use. Well with parts being hard to buy here in St. Vincent, I found another crazy cheap DIY fix. Take a look

其實我今天才發現這篇超強的文章，有人把BB的鎖牙端改成用礦泉水瓶的頭，這除了有才還有什麼，太天才了!!!!!

難怪最近製造BB的工廠紛紛倒閉了.....