Any reason you are going with a round shape Don?
My home-mades are all rectangular 'boxes' and just push-on the flash head...I use cardboard from a cornflakes box, cut to the length I want (to vary the size of beam) and the width to fit over the flash head. I cover it all with gaffer tape. The attached set-up shot show two in use - one has a lavender gel in a high tech holder...
For gridded snoots, I use black bar straws, although I have been meaning to try out the coloured straws to see how it colours the light.
The bare snoots fold flat, so take up no room in my bag. I have been meaning to glue together a bunch of short straws that would slide inside the end of a bare snoot...hopefully that should still control the light spill whatever the length of snoot used.
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