Chain would not fit 10T sprocket.

[Li'l Popeye]

Well. I have "upgraded" from #219 chain to 1/2" chain.
It is 1/2x5/16 chain, so I thought all was good... It did not fit the 10t sprocket.

I found out afterwards that this chain has larger diam rollers as #40 chain.

So what I did was milling the teeth of the sprocket with a larger diameter.
Now it fits.

 

[Li'l Popeye]

This was 08B1 chain. I have now ordered ASA40 chain, that should be the right one... Same pitch, same width, slightly smaller roller diameter.
All these differences in same 1/2" pitch chain...
The 08B1 chain is the same as #428 chain. What I can find is that both have same roller diameter, same pitch and width.
Well next time I need to look things up a bit better before ordering.