The following measurements listed below are an update to the previous measurement shown. These are a lot more accurate and were kindly done by my friend and ex engineer Terry with professional Vernier Calipers.

However, before going any further I have to own up to a previous mistake on Diagram 4a. The previous Diagram 4a shows measurement ‘B’ going to the first shoulder on the Collar (17), this is incorrect as it should be to the second shoulder. The new Diagram 4d illustrates my mistake.
Diagram 4a has been updated to reflect this change and a new Diagram 4b lists additional measurements not listed before.

The important difference in measurements here is ‘B’ on Spacer/Collar (17), as if this wears then there will be no free play in the Clutch Primary Gear.

Accurate Vernier Caliper Measurements in mm
- - - - - OLD- - - - - NEW
A - - - 45.07 - - - - 45.08
B - - - 40.08 - - - - 40.92
C - - - 22.03 - - - - 22.03
D - - - 27.98 - - - - 27.99
U - - - 27.98 - - - - 27.99
V - - - 22.04 - - - - 22.03
W - - - -nm - - - - -15.07
X - - - 17.94 - - - - 17.97
Y - - - 10.92 - - - - 10.978
Z - - - - nm - - - - - -2.97
nm - Not Measured