This is related to Worn out chainring or missing tension
Today the chainring arrived, but it lacks a pin. The pin is 15mm (0.59") long with a diameter of 4.1mm (0.16"). It is located in such a way, that it points away from the bike, but is covered exactly by the crank arm.
I believe that its function is to prevent the chain to get stuck between the chainring and the crank arm, should the chain jump outwards from the chainring.
I fear that I bought the wrong replacement.
I bought this one Shimano FC-M523 / FC-MT500-3 10-speed Chainring for Chain Guards but maybe should have bought this one Shimano FC-MT500-3 10-speed Chainring (40 tooth variant). The latter was missing a proper picture (has only the 30 tooth variant) and was out of stock in all the shops I searched for.
Now I'm believing that the solution to my problem would be either to buy Shimano Chain Guard for FC-M4050 / FC-M4000 or just ignore the problem. Maybe you know of any other solution.
I had the chain guard in the shopping basket, but when I read about its function on biking forums, they were saying that it's just to keep the trousers clean, so I ditched it. But maybe it does have the function of the pin, but all around the chainring, which sounds like a solution.
Any comments or recommendations on what I should do? I wanted to assemble it today so that I can use it tomorrow, but I guess I'd be OK with waiting a couple of days to have a proper solution.
Update: The wear of the chain drop pin is as follows, which leads me to believe that just ignoring it probably isn't a good solution.
New idea: Would going to the hardware store and buying a screw with nut a reliable option?