4-Cross Shaft Assy  

417-Casing Thrust Washer, 425-Thrust Washer, Outer, 426-Thrust Washer, Inner and  440-Steel Balls where not removed from 401-Cross Shaft. This assembly is the ball bearing for changing gears. 

435-End Piece and 436-End Piece are different, but the drawing does not show which one is which, so the Part Numbers might have been commingled.

Dimensions were difficult to add around the drum brake, therefore I made a drawing of the cross section, by using the program CadStd .
A *.cad file is available upon request.

 Friction material:
Apart from the friction materials Ken Philp mentioned on his website http://kenphilp.web.officelive.com/friction.aspx  , David Moreton mentioned that  strawboard was used for friction drive wheels from about 1900 to 1920 although cork gets a mention around 1919. Other materials are also mentioned but were not reliable such as leather and wood fibre.
Strawboard is a variety of cardboard made mainly of straw which has been boiled in lime or soda to soften it.

He found on the Internet that the friction drive was not just used for the Neracar; more companies supplied friction drive vehicles in the early 1900s, namely Lambert and Cartercar, and it is easy to see where Carl Neracher came up with the idea to modify the design to fit into a motorcycle.
For more information on friction drive manufacturers and vehicles that used them, see the links below.

 http://www.american-automobiles.com/Gearless.html
http://en.wikipedia.org/wiki/Lambert_friction_gearing_disk_drive_transmission
http://en.wikipedia.org/wiki/Friction_drive
http://en.wikipedia.org/wiki/Cartercar

The Friction Wheel Assembly can be refurbished at:
Paper Pulleys Inc.
http://www.paperpulleys.com/pages/home.html
Shipping Address:
810 Woodland Street
Columbia, Tennessee 38401
United States of America
Mailing Address:
P.O.Box 8155
Columbia, Tennessee 38402
United States of America
E-mail: info@paperpulleys.com

 Friction Wheel, refurbished at Paper Pulleys, using “fiber Filler”.

Pig leather has also been claimed to be a suitable material for the Neracar friction drive.

TBD: There is some ambiguity about the orientation of the fork for the Bowden Cable for the Gear Assy.