Good evening All.
Tube flies, mine just might be a bit different.
I strip the middle of of a Biro type pen.
And use the outter plastic case as the form for my tube flies.

And to go one step further, sometimes add a small propeller at the tail end.
Casting, one a Double Handed overhead rod 9/10 or 10/11w.
Into the saltwater, of course.
Kind regards,
Barry.