Quote Originally Posted by TATsoul View Post
Here's the picture of the backstem. It is a solid backstem with the slit. Very hard to flex since our plastic is a special imported dense Japanese polymer.

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You Have nailed it my friend. Good minds think alike . Now offer a version of all the tubes with needle for $2 and change and you have really put a few tube makers out of commission.
Almost as easy as a how needle with the advantage of disposing everything all together.
Hmmm too many ideas... And free