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So long story short, someone managed to cross thread one of the seat rail bolts while removing and reinstalling the seats. They then simply tapped a larger hole and used a larger bolt to fix the problem.

I would like (purely out of OCD) to go back the factory bolt. How do I make the hole the correct size again? And also, anyone know what the specifications are for the seat rail bolts on a VW Polo 6R?

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  • This was cross-posted over on DIY.SE and got more attention: diy.stackexchange.com/q/133981/43874
    – JPhi1618
    Mar 5, 2018 at 14:44
  • your first concern should be that the repair is as good strength-wise as the original. You should not risk degrading the repair (assuming it was done well to begin with) just to satisfy your ocd.
    – agentp
    Mar 5, 2018 at 16:13

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There are two possibilities that come to mind straight away:

One use a helicoil to provide the size you want, which means drilling out to a larger size and fitting an insert - sounds like this has been done, but is it to the correct size?

Two is to remove the damaged nut and re-weld a new one into place...

I would live with the "new" bolt as is, then my next option would be to do the helicoil...

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  • What has been done is use one of those self tapping bolts of a slightly larger size. No Helicoil was used. I wonder if something simple like epoxy won't work? You are of course right that I should just live with it but it'd be nice to go back to factory bolts
    – user1936752
    Mar 2, 2018 at 9:52
  • So, as I said use a helicoil to get back to the original size...
    – Solar Mike
    Mar 2, 2018 at 10:03

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