Office of Steam Forum for Model & Toy Steam Gas & Hot Air Engines

Hello, I have been really enjoying tinker/refine the smaller "hobby" grade engines as of late. I am wondering if anyone is aware of an engine that is even Smaller than a Mamod MM1?
  This video (not mine) shows the smaller Mamods in a row and the MM1 clearly is the "smallest" in this group.

  I am working on purchase of NIB MM1 but I wanted one with the sort of "Banjo" shaped green Meths burner, this one has the long rectangular Meths burner which I feel burns pretty hot! I am consider purchase any way because of the NIB condition....I may try to make a "restrictor plate" of sorts to tone down the stock Meths burner, or I could also source or make a Banjo style.
  I also hope to find an SP1 but this post is really to ask the forum if there is a smaller vintage type engine of any "brand" out there? -thank you!

The MM1 is the engine in the center:

The spirit used in these burners can be ‘toned’ down by adding a small percentage of water to make the flame less fierce; say 5% H2O added.