Gearbox Lock Washer?

[David H Willis and Associates Limited <davwil@domain.elided>]

When I dismantled my 1750 Berlina gearbox -- how many years ago, now? --
I remember a lock washer on the large nut on the outside end of the
output shaft, holding the giubo spider on the shaft. The washer had an
inner tongue fitting the slot in the shaft, and a tab to be bent around
the outside of the nut. I chucked it; I always chuck used lock washers

Now I can't find a replacement to reassemble the driveshaft. It's not in
any of my manuals or parts books, and the estimable Giovanni
Centofanty can't remember ever seeing one. He certainly doesn't have one
in his box of gearbox bits, either

Is this lock washer a figment of my aged imagination? If so, how do I
hold the nut 'loose' or not fully tightened? Giovanni suggests dinging
the nut into the slot in the shaft. If somebody can confirm that such a
lock washer really does exist, I'll fabricate a replacement

Ciao!
Dave Willis, in passato il vecchio D Howard Anatra-Zoppa
1974 Spider Veloce, still on axle stands for the above reason
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        David H Willis and Associates Limited
 Coastal Engineering  Technical Writing  Ginie cttier
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               davwil@domain.elided
            http://www.magma.ca/~davwil/
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