Record crank 10sp washer?

On a Record/Chorus 4-arm right 10-speed crank:

The 0.4mm washer/spacer that goes on the outside of the outer
chainring at the bolt that screws directly to the crank:

What is it for, and should it be used with TA 9-speed and 9/10-speed
chainrings used with a 9-speed setup?

(Unfortunately I no longer have any Campag 10-speed rings to compare
thickness, if that's relevant).

Many fanx,
~PB

Pete- What is it for, and should it be used with TA 9-speed and 9/10-speed
chainrings used with a 9-speed setup? BRBR

It is because the other arms of the 10s big ring have a little material taken
off of them to make the 10s ring a wee bit closer to the small ring.
If the arms of the TA ring do no have material removed(they do not) no need for
the thin washer.

Peter Chisholm
Vecchio's Bicicletteria
1833 Pearl St.
Boulder, CO, 80302
(303)440-3535
http://www.vecchios.com
"Ruote convenzionali costruite eccezionalmente bene"

Pete- What is it for, and should it be used with TA 9-speed and 9/10-speed
chainrings used with a 9-speed setup? BRBR

It is because the other arms of the 10s big ring have a little material taken
off of them to make the 10s ring a wee bit closer to the small ring.
If the arms of the TA ring do no have material removed(they do not) no need for
the thin washer.

Peter Chisholm
Vecchio's Bicicletteria
1833 Pearl St.
Boulder, CO, 80302
(303)440-3535
http://www.vecchios.com
"Ruote convenzionali costruite eccezionalmente bene"