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How To: Eclipse Clutch Arm Modification

March 11, 2011

The Eclipse clutch was used by Excelsior, Reading Standard and other American marques in the 19teens, and it performs well.  One modification that I made to the 1916 version was to weld the pivoting bracket where the rod attaches onto the arm.  For the 1916 version (a one year only design) is attached by a simple rivet which does not withstand the strain and shear very well.  When it fails it is not particularly evil, as no parts can fall off the bike, and the clutch will stay engaged.  But Eclipse themselves changed the design for 1917 by forging it as one single part.  Mine is now welded solid and works fine.


Modified 1916 Eclipse clutch arm



1917 Clutch arm

forged 1917 Eclipse


1919 German X advertisement from Thomas Bund’s book.  Get your copy here.

german x advert

More Eclipse How To articles here.

One Comment leave one →
  1. October 18, 2011 2:21 pm

    Great-o graphics. I’m working on linkage now. Miss your Excelsior. Thanks, Paul

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