Here's the deal, I use and indicator to control the depth of a fly, to for purpose of strike visuals. As far as I'm concerned, your definition of "fly fishing" is fun, I enjoy fishing dries and dragging nymphs along the bottom but heres the science...
Throw a dart through the air, then throw a hollow plastic ball or solid plastic ball , which has more velocity and less wind resistance.....the dart, of course.
The Spring is extemely light weight and so is the Foam. The art of "fly casting" is to have as little outside influence on a great cast and gentle turnover when fishing nyphms as to not spook trout, other fish prefer to have a fly slapped in front of them.... such as Snook.
While I respect you view point, try making what I said and drop it in a glass of water...see what happpens or dont.
That is the real art of "fly fishing" trying new things... If all it was was classic patterns and the same ol s#$% would you really be so vested in this lifestyle.
PS thanks for the challenge I love a good debate!

---------- Post added at 05:35 PM ---------- Previous post was at 05:33 PM ----------
spring size is 1/8" width x 1/2'" long and whole indicator measures at 2" long