Quote:
Originally Posted by benb
The Shimano pins that do not have the break away piece should never be pressed back in.
That's likely not how they are installed at the factory. They're probably a different shape when they start, they likely do a 2 step process where the ends of the pin are not flared to start. The pin gets pressed in by a tool in step 1, then another tool probably presses down again to flare the ends to hold the pin in place.
This method doesn't damage the links... and it's also the process you use to rivet chains together on installation that require a stronger connection than bike chains.
Not getting why you'd ever grind away with a dremel to break the chain either? You can just press the pins out and replace with the quick link unless the shimano quick link is unlike any of the others?
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The special pins that are pre-installed part way through the side plate and without a "guide" tapered snap-off piece are intended for factory installation where parallel "jaws" press the pin straight in, in a more precisely aligned manner than with normal chain tools. No peening is involved. These pins are "special", have the same retention feature as the aftermarket-style special pin, and the connection is strong. But again these are not "regular" pins like in the rest of the links and should not be installed in the usual manner using regular tools.
Many Shimano chains are sold online with these short/blunt connecting pins (in packaging that includes no regular special pin) because they were sold by Shimano for OEM use, to be installed in a factory with special tooling for this purpose. It is highly problematic that these chains are sold to retail customers who have no idea that the use of even shop-grade chain tools can leave the connection link strength severely compromised.
Using a grinder is the only way to remove a link with a special pinn connecting it. You have the option of leaving that link in place and removing a link elsewhere to break and install a quick link, but usually I remove it if I am going to break the chain to install a quick link.