Reddit mentions of Wiha 40010 Magnetizer or Demagnetizer, Color may vary

Old school mechanic's trick, I was shown how to do this in the late 70's before you could buy magnetic screwdrivers.

Here's a video showing a number of ways to magnetize your tools.

Or you could buy this $7 magnetizer on Amazon that makes it quick and simple.

Edit: spelling.

Wiha 40010 Magnetizer or Demagnetizer https://www.amazon.com/dp/B00018AONE/

have 2x, fantastically easy, not too strong and demagnetizes even the most stubborn irons almost completely.

Dunno how it happens, but you could try a tool demagnetizer: https://www.amazon.com/Wiha-40010-Magnetizer-or-Demagnetizer/dp/B00018AONE

Also: this

I got this a couple weeks ago. Installed it onto an ASROCK Z97 Extreme6 motherboard while in a Define C case, 4790K running at stock currently. The only part that was kind of tough for me was getting the fan retention bracket on , as the center fan has to be installed after the cooler is mounted (had to remove my GPU to install the center fan as well).

I didn't find the two mounting screws hard to manage, but I also used a magnetizer to make the included screwdriver's attraction much stronger. I imagine it would have been a good bit harder to install in the case without that. Power cables were easy with some planning.

If this had been installed outside the case, it would have been an absolute breeze.

Temps are fantastic (generally no more than 45-55 C depending on what I'm doing, room temp is generally between 20-22 C). Tested running the fans at max, very quiet! Anything under 80% is pretty much unnoticeable.

Klein just came out with this beautiful new hvac 6-1. It's perfect for diagnostics and light maintenance when you don't want to lug a bag, and it's so new I doubt he has one. I also love these.

EDIT: I totally linked the wrong tool in the first link. THIS is the beautiful tool I meant to share, although the first is very handy too.

https://3ds.hacks.guide/installing-boot9strap-(ntrboot)
According to the guide I need a magnet to trigger sleep mode, but I'm concerned about my magnet being too strong or too weak.
Here are a few I'm considering
https://www.amazon.com/DIYMAG-Powerful-Neodymium-Permanent-Scientific/dp/B06XD2X45M/ref=sr_1_4?ie=UTF8&qid=1527330981&sr=8-4&keywords=magnet
https://www.amazon.com/Wiha-40010-Magnetizer-or-Demagnetizer/dp/B00018AONE/ref=sr_1_2?s=industrial&ie=UTF8&qid=1527331185&sr=1-2&keywords=magnetizer
https://www.amazon.com/XLMAGNET-Countersunk-Mounting-Building-Scientific/dp/B077GNVYZR/ref=sr_1_9?s=industrial&ie=UTF8&qid=1527331163&sr=1-9&keywords=fridge+magnet
I'm largely looking for one under 15$, and one that won't break my 3ds, or rather my New 2DS.
If anyone has any general tips or a range of magnet strength, please provide those too.

If you want, you could buy one of these and you can magnetize them - its a excellent tool :-)

Same principle, but all of our techs use one of these.

They work rather well, especially on the smaller tools. Bonus demagnetizer.

https://www.amazon.com/Wiha-40010-Magnetizer-or-Demagnetizer/dp/B00018AONE

Homes, get yourself one of those demagnetizer/magnetizer squares, this way you have the best of both worlds!

To add to the other answer, a magnetized screwdriver can be really useful. If you don't get a magnetized one, you can buy a magnetizer.