In order to shorten the link without a chain tool, you need an alternative tool like a hammer, pliers or thin nail. They will assist you in pushing the pin easily. You can position the chain over a socket, and hit it with a hammer. Then, you can now pass the bolt all throughout the open holes.
How often should I change my bike chain?
The 2,000-Mile Rule. To avoid this accelerated wear of your cassette and chainrings, a general rule of thumb is to replace your bike’s chain every 2,000 miles. Mind you, this is just a starting point. No two chains will wear at exactly the same rate because no two riders treat their chains the same. 4
Do all bike chains have a master link? Nope, not all chains have master links. If your bicycle has derailleurs, it means it’s unlikely that your bike’s chain will have a master link.
How do you put a pin back on a bike chain?
Lift the inner end of the chain off the pin. Lay the outer end of the chain flat so the pin is now horizontal to the ground. Apply hammer again to the outer piece (the bit without the pin in) until the holes of the outer pieces are back into alignment. Now use chain tool to screw pin back through all pieces as normal.