Plugging "mini oil can" into the search came up with this:
www.homemodelenginemachinist.com
The plans are in a zip file at the bottom of post #10, dated 26 Feb 2017.
Nice work on the launch engine.
Regards,
Chuck
Mini Oilcan hand operated
Hi together Happy New Year 2017 to all readers, builders and people here! I just finished a little Project from which i saw a picture on the internet. Some of you might have seen it on Find Hansens website. I couldn`t find any further Information about it, so I started to build it from...

The plans are in a zip file at the bottom of post #10, dated 26 Feb 2017.
Nice work on the launch engine.
Regards,
Chuck