1. Lowering Mechanism Torsion Springs Reverse Cam Hydraulic Piston Clock Spring Padded Free Fall String

2. Torsion Springs + Easily made as bolt- on - Weight may cause need for more resistance - Torsion springs need to be very strong

3. Reverse Cam + Smooth motion + Easily manufactured - Requires significant force - Will generate much wear

4. Hydraulic Piston + Easily regulates closing speed - Not simple to “bolt-on” - Obtrusive and large - Possibly expensive

5. Clock Spring + Easily reset + Easily incorporated into seat design - Damping may be difficult - Design by trial & error

6. Padded Free Fall + Seat stops with no noise or damage + Low cost / simple - Uninteresting

7. String + Inexpensive - Easy to break - may still slam - Uninteresting

8. Timing Mechanism Falling Piston Ball Maze Kitchen Timer Falling Liquid/Sand Falling Weights

9. Falling Piston + Reset is feasible - Cost may be high - May be too large & obtrusive

10. Ball Maze + Very neat and fun + Visually pleasing (if Plexiglas idea is used - May be loud - Reset may be a problem with manual override - Seat may be too thick

11. Kitchen Timer + Accurate + Adjustable - Difficult to attach - Difficult to reset

12. Falling liquid/sand + Self contained - Seat may be too thick - May be difficult to reset quickly - Locking pin may complicate manual override

13. Falling Weights + Release and timing are integrated already - May be obtrusive - Two different orientations may cause problems

14. Locking Mechanism Spring/Ball Bearing Lock Spring-loaded Pin Lever attached to seat Divot in Reverse Cam None (Equilibrium)

15. Spring/Ball Bearing Lock + Very easy for manual override - May not last long - May get dirty inside

16. Spring-loaded Pin + Very simple & self contained - Too difficult to manually override

17. Lever + Very simple & self contained - May cause problems with manual override

18. Divot in Reverse Cam + Smooth locking + Easily overcome by human means - Not easily overcome mechanically

19. None (Equilibrium) + Very simple + Looks like regular toilet seat - Trigger from timer is less predictable seat to seat