Are you selling those as built Greg??
Those ARE back massagers right? I could really use one of them now. lol
If you made them I could use about 90 18 tooth 1/4" bore 25 chain. Could I get them by Sunday?
hmm very interesting 
The only odd thing about them is that there are 5 sets of two. Unless one of those sets is a spare thats a weird number. I suppose there could be another non machine set of sprockets which would bring it to a nice round 6 sets but they aren’t on display.