[Fitron: I doctored up your lower picture, of the first two pictures you posted,as reference. Ok, someone either pulled open a solid link by the two ends(outmost section of link), or they pried open a connector - this would have occurred at point "C"

. Anyway...
PUsh spring bar at "A" which will release the center/connecting link of "B". Decide how many links you want to remove. If you want to remove just 1, you will have to pull "B" apart. For two you will need to pull apart the one to the right of "B". Those solid links have solid pins that are pressed in - you can pull the link apart by grabbing at both ends of the link and pulling. Hard part is deciding what to grab the link with(a "doctored" up pair of retainer ring pliers can
occasionally pry the outmost sections apart, which leaves little damage to the link). Some of the solid links have pins that actually went all the way thru the outer pieces - those you can press out with an arbor press (or vise if you are particularly crafty)....most pin vises for bands won't be able to push them out.
Very rarely should you be faced with tring to pry open one of the center connector links....generally better to pull apart the outer portion of a link, IMHO. The center link will look like crap if you work on it....kind of like that narrow band connector link on a classic Witt. LED.....lots of nice ones BUT they have a
wavy connector link

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