[Angostura]

Worth popping an aftermarker SSD (or Fusion Drive) in there.

[systemtest]

I did it once and removing the big glass plate assembly with magnets is nerve-wracking.

[sudhirj]

And no longer possible, think the newer models have fused glass.

[rudiv]

Replacement is still possible (I used to work in a shop that did the same) but definitely way out of the reach of users. If I recall correctly, you have to order replacement adhesive from Apple, and when I was working there third-parties hasn't come out with their own replacement adhesive yet (Apple will not sell any sort of parts to users).

[tonyedgecombe]

You can buy self adhesive strips on eBay, I upgraded a 21.5" machine last year.

[scarface74]

Or just buy an external drive....