Hooking up a horn switch to fuse block

Alright guys, I'm trying to hook in my own horn switch and I was going to get power from the fuse block so I was wondering how I'd hook it in.



I was thinking I'd stick the fuse at the red arrow and power to the switch at the green arrow which is labeled BATT. Am I on the right track here?

edit: bonus electrical diagram, the one labeled 12 is the one I'm looking at
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What year? Most horn switches ground the horn relay. The power is to the relay and the horn button is the ground for the relay.

Here is a typical circuit for a Renix.

It is a 93. So would I just run the black wire to the switch and then ground the other side of the switch?

Horn circuit 93




Often a horn fix is as simple as removing the three Phillips head screws under the horn button and cleaning the slip ring (contact plate) with a good solvent (it gets coated in grease) and the brush (contact) or getting the spring from an ink pen and replacing the spring behind the contact (brush/contact that rides on the slip ring) somebody has lost or just stretching the spring that is already behind the brush (contact) a little.
Sometimes the horns themselves just die.

Alright... I know for sure that I've lost the spring that came out and the little plastic(?) piece that went in it. Could I just replace the spring and it still work or do I need that piece or something like it? Thanks for the help so far. Appreciate it much.

I think just the spring might wear down fairly quickly, the pin (or brush) should be standard 80s Chevy and not too difficult to find. I really can't picture the retainer in the parts blowup, I doubt it's absolutely necessary.
If you have some brass brazing rod, you might make your own pin, I know an ink pen spring of the right diameter works fine, from experience. I've lost a few springs, but always managed to find the pin again, a magnet can be your friend. I keep a few old speaker magnets in the shop, nice to have around, especially if your working in gravel or grass. or even finding small pieces in the carpet.