Just wanted to share this here, since its stupid simple and I haven't really seen anyone else do it this way. I'll leave it to you to figure out which bolt size works best for you, I'm using a 3/8" bolt.
Preparation time: 5 minutes
Ingredients:
1x Bolt
1x Nut for Bolt
1x Circular Magnet
2x Plastic Washers (Can be 3D Printed)
Superglue to taste
CA Accelerant (Optional)
Step 1: Take the bolt and sand down the top. I did this on a bench sander, but it could easily be done with a file or sandpaper. A nice flat top free of markings will help the bolt adhere to the magnet.
Step 2: Glue the top of the bolt head to the magnet.
Step 3: Glue one plastic washer onto the nut.
Step 4: Glue the other plastic washer to the bottom of the bolt head.
Step 5: Thread the nut onto the bolt, it should spin freely. If needed, a little tiny bit of lubricant can be applied to the inside of the nut.
Enjoy on the metal plate of your choice (magnetic)
Funny - I was using something similar to mount a webcam on devices - never thought of adding another nut to hold things down. If you use 1/4"-20 bolts, the same setup will work as a camera/webcam mount. I'll be building more of these over the weekend.
Hey Dylan -- this is ridiculously clever! I've been looking for some of those fancy spring-loaded magnetic PCB clips, but this is so simple and easy I can't believe I never thought of it! Headed to Depot tonight to round up the hardware. Wrote it up for the blog, too, should publish soon. Thanks for posting this, very cool idea.
Thanks for the inspiration Dylan. I went and rolled a version of my own: https://hackaday.io/project/202216-another-spin-on-pcb-clamps