Some recent bowflex treadclimber auctions:
Nautilus Treadclimber Safety Key with Clip TC1000
- Nautilus Treadclimber Safety Key with Cord and Clip
- Bowflex Treadclimber Safety Key with Cord and Clip
Will work on the following model;
TC1000
Rating: 
(out of reviews)
List Price:
Price: $ 19.99