Everyone who has gone to two hand Spey casting is single hand Spey casting, even in the mangrove in the tropics.
Everyone should try some single hand Spey casting for smaller Steelhead streams like the Trinity river.
Here is a video from Simon Gawesworh of Rio Products.
https://www.youtube.com/watch?v=t4dzHmYrVds
Bill,
Jeff Putnam has a DVD "Single-Handed Fly Rod Casting
Using Spey Casting Techniques." All of his videos
are excellent. One can see "teasers" @ http://jpflyfishing.tv/index.htm
Best to all,
Larry S
Sun Diego
Except for a time when "A River Runs Through It" and "Rivers of a Lost Coast" came out, Jeff's Single Hand Spey casting DVD is the shop's best seller.