About this 3D model

This is a locking cylinder puzzle, based on orignal design by Wil Strijbos (https://www.mrpuzzle.com.au/first-cylinder-take-apart-progressive-move-puzzle.html). It requires 4 or 5 3/8" ball bearings, and 1 (5/8" x 1-9/16") spring. The outside of the cylinder is marked with lines representing 5 increments each. The correct orientation to solve the puzzle is the Answer to the Ultimate Question of Life, the Universe, and Everything (#42). Solution: https://www.youtube.com/watch?v=-kv2sTiPHsM