Mentioned previously that I wasn't too happy with the pin design in the top of the case for using slim fans up there. Even with the slim fans installed, the long pins (designed for normal fan thickness) were pressing down on my NH-C14S cooler when I put the lid on. It wasn't particularly bad but you could definitely see the heatsink 'notch' down when you snapped in the pins from the top panel into the chassis. So I set about trying to fix it...
Tried to find a threadless bolt of some kind that could replicate the original pin in thickness but it was actually pretty hard to find something unthreaded. There's plenty of dowels and metal rods of the right size but then it needed to have a head on it, that was wider, to prevent the fans dropping out of the pin if the case was ever moved or nudged.
The cheapest method is far and away just getting some threaded bolts but I didn't want the fan housing and rubber grommets of the case to be eaten away over time with installing and uninstalling - so that's when I discovered something called a clevis pin. Which was designed for something much more sophisticated than this application but it works really well.
This was before with the original pins:
And this was after:
For anyone that is interested in the dimensions of the pins, they're 4mm (m4) in diameter and 25mm in length.