Why don't you add a photo link?
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If there are holes in the case itself, you just need some shelf pins. If there are no holes, get a shelf pin jig and it should be quite easy to do.
Edit: An example of shelf pins. Should be able to find them at your local hardware store.
https://www.amazon.com/Support-Bookshelf-Shelves-Cabinet-Furniture/dp/B094NPL7TW
Thanks for this, just one question though.
The single shelve that's already installed I see has has some wide screws in the bottom. I'm not a handyman by any means (hoping that can change), but I have put together IKEA furniture before and they seem to resemble these pieces I'm familiar with where you screw them in on the bottom to help hold the pieces connecting them to the frame in place.
With this said, would the shelf pins still be fine? Just want to ensure everything will be properly sturdy is all.
If I am imagining it correctly, it should be just fine! This is a pretty common design. The middle shelf provides the stability and the other shelves provide adjustability.
Perfect than! Thanks a million. I asked on another comment about stability of the other shelves being on the pins rather than directly attached, but I should be good to go once that's sorted.
No problem! If you want for sure confirmation, feel free to reply with a pic of the whole unit, but I am very confident based on your description it is good as is.
Sometimes the shelves sit on top of the little adjustable nubs. Would that be acceptable?
You probably don't need to add holes to the shelves. There are pegs that go into the adjustable holes that are flattened on one side, and the shelf just rests on them. Should be able to get a set of universal ones from the hardware store for pretty cheap if the originals are missing.