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I had a one foot pre beveled PVC pipe 130 turns from an antenna build. I wound it in 10 minutes while watching TV. 3D printed out the ball (free at Library). I will try to program a 3D print for the blank tube with guide gullys to assist in winding.These are my measurements taken during construction for comparison: windings only 48.03 uHy; with cap 52.75 to 60.00 uHy, touching cap 65.00 uHy.I will post more about my build as I continue. Having trouble finding UF diodes so will have to order on line. I am also designing a 3D base to hold the batteries, componants and some additions like a switch, trim on inductance and a 12v power supply plug. Basic operation first.Don VE3REO
This is a second attempt at the build. The football antenna blank was printed on a 3D printer. The winding of such a large coil took over 80 feet of 30awg.The pancake antenna creates 7.848uHy and the football innards makes 443.6 uHy. Just saw a picture of a small football like the first one I made. Wish instructions were more like a Ham Radio build.I will help anyone if I can.VE3REODin McPhee
I built the K2. Wished I did it years ago.
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