[TCML] Secondary form material

[Andrew Robinson <teslamad@xxxxxxx>]

As many have already discovered, PVC is apparently a terrible material 
to use as a secondary coil form. About a week ago my engineering group 
also discovered that acrylic is extremely hard to work with. We ended up 
cracking our only secondary coil form which we slaved over to find! So 
my question to everyone out there is what on earth should we use for the 
secondary coil form. We need a 4" OD coil form and if possible, if you 
can name a material that can also be an 1/8" thick we have a nice 
cutting tool that makes the most perfect end caps. So ideally 4" OD and 
3.75" ID is perfect for what we need. I've called numerous plumbing 
companies with no help what so ever. Thanks everyone!

Regards,
Andrew Robinson
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