eyeclinic wrote:
I'd like to try and turn some single-piece darts on my lathe using some
SS rod. The turning should not be a problem but I need to know how to
cut the 4 grooves in the flight(plastic "wings") end. Any ideas?

Rich

Depending on your equipment, the ideal way would be to use a slitting
saw in an indexer attachment, on a milling machine.
A minimill would do it, as would a $30 indexer with a collet to match
the dart body.
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Rex Burkheimer