I reached out to appletree a couple months ago…they said it would be a while before its retailed still sussing out details
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I just finished my latest tuttle project. I cut down my F4 TX (Tuttle AX) mast from their claimed 82cm (more like a 85) to a true 75cm. It was a little too wobbly at that length and feels a lot more direct at 75cm. Worked a charm. Since bending stiffness goes with the length to the third power - a 75cm mast is about 45% stiffer than a 85cm mast in bending, which I bet a lot of people will be surprised to read.
I made a dozen pairs of the tuttle potting molds and got a good price. If anyone else wants to make one, hit me up. I can sell you a potting mold for $300.
1)cut to length and marked for the angle cuts 2) prepped for molding, needed to thin out the thickest part of the foil section to 0.625" with a sander and roughly round off the angled part 3) out of the mold
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oh, and I wetsanded it to 800 and it sure feels slippery, but who knows if that is just because the tuttle 
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What’s the process here? You cut the mast shorter, then cut a rough tuttle shape and then use the mold to fill in with epoxy to a perfect shape?
Yes, I cut a bunch of carbon cloth with scissors to make short fiber and filled the epoxy to about peanut butter consistency. Slather it on and clamp the mold shut. It’ll squeeze out all sides. I like to add a little black tint to the mixture because it looks better but no need.
then I 3D printed a drill jig to drill the holes. You can buy the stainless steel cross dowel nuts on amazon.
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