Best tool/technique for standardising size of pot holes

[Beedster]

Hi folks, I have a bass body with rear access to the control cavity and what can only be described as a number of experimental holes - 7 in total - from the cavity to the front surface of the bass. I want to fill these with dowels, but each hole is a slightly different size so I want to standardise them all at 12mm to allow me to use 12mm dowels for all holes. I was going to use a 12mm drill but suspect that despite being quick and easy it might cause more harm than good, I then thought about using a round file but I imagine that's the hard way and will likely leave me with irregular/not-round holes. Thoughts re tools/techniques welcome 🙏

[Hellzero]

The best way to do it is with a router, Chris.

[Hellzero]

Or you can use this tool, if you're doing it slowly, it will be very good: https://www.ebay.co.uk/itm/264935588930

[Beedster]

4 minutes ago, Hellzero said:

Or you can use this tool, if you're doing it slowly, it will be very good: https://www.ebay.co.uk/itm/264935588930

 

Tony, that is exactly what I'm looking for I suspect, many thanks mate 🙏

[Hellzero]

I'm still using the one my father bought 50 to 60 years ago, but it only goes up to 10 mm and uses a screwdriver handle, so hard on the palm of the hand. 😉

[Beedster]

Just now, Hellzero said:

I'm still using the one my father bought 50 to 60 years ago, but it only goes up to 10 mm and uses a screwdriver handle, so hard on the palm of the hand. 😉

 

There's something magnificent about old tools, a mate of mine found one at a boot sale, and a few years later has a collection to rival some bass collections!

 

Thanks for the advice, some jobs require the combination of high attention and effort and low speed 👍