It's here somewhere.

[Tommo]

During the discussions about the birth of H.D. and the H.D. motorcycle serial #1 someone, somewhere made comment with regard to an unknown German gentleman that assisted the founding fathers in their endeavours. Maybe I have the answer.
While in Milwaukee for the 100th I purchased Jean Davidson's book "Growing Up Harley-Davidson" and on pages 36-37 she mentions a German born mechanic EMIL KROEGER who was a good friend and mentor to them.
Whoever was asking is this the name you were seeking?

Tommo

[Harleyson's]

or you can go more than 20 Years back to Harry V. Suchers Book:
Harley-Davidson - The Milwaukee Marvel on Page 14 -

"one Emil Kroeger (or Kruger)"

[Earl]

Or, for another analysis of this name and this person, you could check out footnote number 24, on page 192 of Herbert Wagner's new book, "At The Creation".