Nagoya RB-400 – it just fell to pieces

I purchased a new, unused Nagoya RB-400 lidmount antenna mount from a seller on eBay. After a couple of days of use, I was going to adjust the angle using the hexagon socket screw. When unscrewing it, a part of the mount just fell off (see photo).

I did not overload the mount (largest antenna used while driving was a 65 cm whip). Did I overtight the hexagon scew? Obviously 🙂
I’m quite used to dealing with mechanical stuff and I applied a resonable force while tighting it, to keep the antenna upright while driving but not really enormous force.

I guess it was a manufacturing fault but getting it replaced from the eBay seller would cost me a great part of the price as a new one as the seller policy for returns was that the buyer pays the return cost. Worst case is that it was a construction issue and in that case I will probably soon end up with the same result. I didn’t want this to be bothering me anymore.

Instead I went to a local ham shop and bought another (more expensive) brand and the RB-400 went into the trash.

Anyone else who have experiences like this with the RB-400? My experience with Nagoya products so far is not impressing (see my article on RB-66 rusting scews), so I will probably avoid them in the future.