im sure I remember somebody asking about these, well I found a source of them here;

South Bend No-knot Eyelets for fly lines (2 pack)

hopefully they will come in useful for someone.

Very interesting Jonnie, I wonder if they will cause cracking/hinging in the line.
Thanks for the link. S.

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"A glint of sun has warmed the air,The flies will soon hatch out, To lure and tempt from their deep lair, The bonnie speckled trout." SKB tackle supporter. I love Furled Leaders.

These things appeared years ago and were generally considered to be a 'waste of space'. Inserting them into the tip of the line is an interesting way of spending time and best done out of ear shot of younger family members. Hingeing and cracking was a real issue as was security - best advice was to whip over where the eyelet was inserted.

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[I]"I still don't know why I fish or why other men fish, except that we like it and it makes us think and feel."[/I] Roderick L Haig-Brown

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[url]http://www.gameanglinginstructors.co.uk/[/url]

I'd guess metal ones would. If someone came up with the same thing made from engineering grade flexible nylon (or other polymer) that might solve it.....