Actually Corse Record or C-Record had three different shifters. the Synchro II, regular friction and Doppler more popularly known as "retrofriction".
for Synchro to work the insert in the lever need to be matched to the model of derailleur, the number of cogs (speeds). then you need the correct freewheel and chain.
personally I recomend you look for Suntour microratchet shifters, the afore mentined Simplex or these,
http://store.velo-orange.com/index.p...-shifters.html
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“One morning you wake up, the girl is gone, the bikes are gone, all that's left behind is a pair of old tires and a tube of tubular glue, all squeezed out"
Sugar "Kane" Kowalczyk