Answer 1: see how long, pry open with needle-nosed pliers went, cancel redundant part, combine the rest again next good.
Answer 2: remove one section with a vice and return it as it is.Answer 3: go to the shoe repair shop and see if you can cut a little offAnswer 4: side tie knot, knot place put apart annulus, hang next tie-in pendant is concealed.
Attached some chain bags for your reference: