I tried to open the magsafe connector also, but that was not successful yet! Will be trying heat next. Here are some pics of how I tried it.
carefully cut 2 slots on the side.
This is the end result
support the connector by the sides. These 2 clips are from a picture frame, but were too springy and jumping all over the place.
Found a thin steel bracket from a hard disk mounting in a pc, bent it in a U-shape. Put a pair of normal pliers to catch the edge and hammered it with nylon hammer.
But all this failed, even after brute force. So heat is next. But won’t the heat gun melt the led and even solder?
David @mrpicklesauce , where did you put the pliers / what type did you use, the edge is small and in my earlier attempt it kept slipping off.