I found the plan on how to make this a couple years ago and built the machine but i never got the intervals to work for me. I spent about an hour looking for the orignal or mirror post with the directions but i cant find it!
I can only find the more recent versions that sits on the bridge of your nose.
Does anyone out there have a link to the plans or remembers what i am talking about?
A quite recent one includes a common timer, could it be that one?