| Year | 2017 |
| Date | 28-Apr |
| Volume | 218 |
| Issue | 4,559 |
| Page | 648 |
| Category | Stationary Engine |
| Part | |
| Title | Puffie |
| Author | Wolfgang Tepper |
| Notes | Makes a tiny 'executive toy' that requires some precision machining. Philip Duclos describes, oscillator control, reversing valve, production tools, fits and tolerances, oscillator |