Jamie, to break up my chain I use a pair of needle nose pliers, a small nut a centre punch and a hammer.
Put the nut under one side of the chain and use the punch part bash out a pin in the right place. Then Twist the loose link out of the way turn over and repeat until it is broken.
To re join, Hold the nut in the needle nose and use the hammer to hit the nut around the link hole so that the pin pops in the the hole, turn over and repeat.
Seem long winded, but seems to work, no need for split links only had one failure on 4 chains in 2 years in DB5, which was last weekend. But the chains really need replacing now.
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