Spring bars are the tiny little bars that you use to hold watch straps in place. They have a tiny spring inside them and the ends are telescopic so you can push them in, put the strap into place, and then when you release the tension, they will spring out and they hold the watch strap back in place. Therefore, when a watch strap needs to be altered you will need a spring bar removal tool.
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One of the 'knobs' on this quick-release strap has broken off
