If it's really a pinhole leak then clean everything up very well with some brake fluid
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/ solvent.
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Then give it a go with some liquid metal type stuff, and if it holds you've saved a bit of effort swapping it out.
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.
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.
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If you want to do it properly then of course a proper replacement would be on the cards.
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.
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.
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but I'd probably go with the first route, if it doesn't work you've only lost out on a few pennies worth of gunk.
![Smile :)](./images/smilies/icon_smile.gif)