# Rusted exhaust bolt

**URL:** <https://community.cartalk.com/t/rusted-exhaust-bolt/121335>\
**Category:** Maintenance/Repairs\
**Created:** [July 20, 2018, 12:35am UTC](https://community.cartalk.com/t/rusted-exhaust-bolt/121335 "2018-07-20T00:35:47Z")\
**Posts on this page:** 1\
**Page:** 2

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**Author:** ![George\_San\_Jose1](https://avatars.discourse-cdn.com/v4/letter/g/e5b9ba/32.png) [@George\_San\_Jose1](https://community.cartalk.com/u/George_San_Jose1)\
**Post date:** [July 21, 2018, 2:34am UTC](https://community.cartalk.com/t/rusted-exhaust-bolt/121335/22 "2018-07-21T02:34:05Z")

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> [@Cavell](#):
>
> nice to have drill press to keep drill somewhat centered but go easy so it wont walk too far off centerpunch

There’s a specialty bit available that sort of looks like a pineapple (or maybe a better description is what a differential pinion gear looks like, only smaller). I’ve never tried it, but the idea is you grind the end of the stud flat, then use that to make a bowl-shaped depression. Then when you start drilling, the bit naturally starts at the bottom of the bowl, which is the center of the stud. I’ve not been able to find a picture of what it looks like b/c I don’t know the name of that type of bit. I’ve seen it as part of bolt extractor sets in hardware stores.

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