Perhaps the screw was welded to the cap on the inside, and that weld broke.
A quick-and-dirty fix: put a thin nut on the screw, and tighten it while holding the end of the screw so that the threads are not damaged (e.g. with a rubber band around it held with pliers). Place a large washer, the same thickness as the nut, around the nut, to bear the weight of ...
Well, I was able to get it to hold in place by wrapping the screw in a decent amount of packing tape. Seems like it's holding well, and of course as long as the screw is fastened the leg will do the rest of the work.
Still, I am definitely open to better band-aid solutions or what a proper fix would look like (i.e. would I need to weld it?).
They gave you four lock washers instead of 4 locking nuts. No problem. Install the bolts as shown in the instructions. Then install a flat washer on each bolt followed by a lock washer and then the nut. Tighten as specified.
I wouldn't use those screws since you have no way of knowing how they were installed. However, I would suggest you look into brick hanging clips (use Google to find them). These are made of metal and are designed to grip the bricks. No holes are required. You made need a number of them depending on the weight of your stuff. I have used them to hang pictures ...
Basically apply more force.
They may break, depending how jammed they are - they are cheap zinc castings most of the time. The screws they connect to are usually steel so they are likely to survive, and you can get replacement cams (or join the "my knockdown furniture is missing a few cams" club, which is large and not exclusive.)
You might try the trick ...
1/2" plywood would be fine. If the hardware has keyhole mounting holes, I'd get 1/2" pan head screws for that. Get whatever size would fit the keyhole. Disclaimer: YMMV, IMHO there's no fire risk, despite all the hardware, there's very little power actually being drawn, so I wouldn't worry about that.
Command (brand) hooks are usually the go-to for ...
You have some nice tile there. It would be a shame to drill holes in it.
If you look at the customer reviews on the IKEA product page you can see this. You might want to consider that.
If you do decide to use 3M Outdoor Mounting Tape some things to consider:
This tape is considered a permanent mounting system.
Make sure that both rails of ...
The strength of 10d nails and #8 screws are similar. Nails have a slight advantage in shear and screws have an advantage in pulling the two members together. Here’s an article that explains it better:
I’d use a power driven 10d box nail because it tends not to ...
With that many I would probably use nails in my gun. If you don’t have a gun but do have an impact driver I would use screws , this would be the last time I used that guy , yes there are structural screws I like fasten master torx head, these have a long smooth shank with the threads on the bottom 1/2 maybe slightly less on 3”.