I'm using an 1/8th" chain on a 1/8th" chainring and a 3/32nd" freewheel. See
http://www.peterbrueggeman.com/
Others have reported using 1/8th" chain on 3/32nd" freewheels in past CR discussions (in the CR Archives). It depends on the 1/8th" chain, some are too beefy and laterally stiff to work like a Reynolds Elite chain.
Peter ============================================ Peter Brueggeman La Jolla California USA pbrueggeman(AT)ucsd.edu
"... I've heard that others say you can use a 1/8" chain on the 3/32" cog just fine but I haven't tried it ...Mitch Harris"