hot water bottle key for arthritus

This thing was made with Tinkercad. Edit it online https://www.tinkercad.com/things/71UWouWDqU5. I couldnt find a hot water bottle for arthritus sufferers but this has become popular for the over 40's in my area so I thought I'd share it just in case it proved popular else ware #handy # open source # arthritus # helping hand