Puzzle

[ewx]

Some time ago I was given a puzzle consisting of 38 small wooden blocks:

All of the blocks are identical except for one. I took it apart, taking photographs at each step. In the end:

It then sat on the shelf for some years. My first attempt to put it back together, yesterday, came very close but ended in disaster. I tried again today and although it needed some partial disassembly, study and reassembly to correct its internals, I succeeded at last:

(The puzzle is sitting on a different face in the solved photo to the original, if you think it looks different.)