Considering the intended use for which this kit is marketed, a potential quality or reliability issue of this severity with the Spark-Lite warrants in my opinion further explanation and action from the supplier.

Unless you are operating in an extremely corrosive environment, I would request a replacement directly from AMK, otherwise they would remain unaware of the actual failure modes and failure rates observed in the field.

Sounds like there are several questions on the table with respect to the Spark-Lite:

1. What is the expected failure rate and life expectancy (including under long term storage conditions)? (No mechanical device sold to the masses will ever be completely fail-proof.)

2. What are the known contributing factors for this type of deterioration? (e.g. time, temperature, shock, vibration, humidity, etc.)

3. Will AMK stand behind the product (even though I assume they do not manufacture the Spark-Lite) and offer free replacements?

4. Is there a recommended time interval for checking and or replacing the Spark-Lite? Should this be added to the product instructions?

5. Does simply using the Spark-Lite in checking mode significantly hasten its end of life?

6. Considering the space it needs to fit in, is there a more robust fire-starting component available?