Handwarmers S04E04: Rebuilding a Jon-e Giant Handwarmer and regulating the temperature
Channel: Mountain Parameters
Date: 2020-01-11

I was gifted a Jon-e giant that had been in use for a few seasons. I still worked great and achieved temps of 150F. But the cotton in the reservoir showed significant charring, and I wanted to see what results a rebuild would achieve by using varying amounts of catalyst. So I decided to refresh it by pulling out the charred cotton and adding some carbon felt, and then replacing the platinum catalyst.

Timeline:
00:00  Overview of the Jon-e handwarmer before it is de-constructed
1:00 Comparison, Jon-e spring and standard spring
1:07 Inserting platinum catalyst pad into spring using tweezers
1:36 Charred cotton in reservoir
2:00 Removing the charred cotton 
2:10 Inserting carbon felt
2:30 Placing catalyst filled spring into head of Jon-e handwarmer
2:50  Results of first heat test
3:50  adding second catalyst filled spring
4:55 time lapse for second heat test
5:10 Results of second heat test
5:42 materials list
5:50 tools list
6:00 End