I had a zipper that wasn't engaging when closing. I watched a few YouTube videos and it said to?

... tighten the slider with a pair of pliers so I did but I must have tightened it too much now its stiff and barely moves. Ive tried putting graphi

... tighten the slider with a pair of pliers so I did but I must have tightened it too much now it's stiff and barely moves. I've tried putting graphite on the teeth, wd-40 (lubricant) and even some Vaseline. Are there any other suggestions or is it a lost cause and it needs to be replaced? Thank you

or:... tighten the slider with a pair of pliers so I did but I must have tightened it too much now it's stiff and barely moves. I've tried putting graphite on the teeth, wd-40 (lubricant) and even some Vaseline. Are there any other suggestions or is it a lost cause and it needs to be replaced? Thank you

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