I saw this mentioned in a thread the other day and thought this might be useful.
From RR - Little guide to making accurate butterflies - lathe+mill needed.
http://retrorides.proboards.com/index.cgi?board=usetharch&action=display&thread=93695
From RR - Little guide to making accurate butterflies - lathe+mill needed.
http://retrorides.proboards.com/index.cgi?board=usetharch&action=display&thread=93695