I managed to find 5 meters worth of ex factory stock end last year for my wingback retrim (see my build thread) I have a lead on some in Germany but be prepared to pay silly amounts for it. The remains of what I had sold very quickly to a customer of the trimmer I used. This stuff is hens teeth and what I found took a lot of effort and a bit of luck! If people are interested I can follow up the lead and see what can be done. I think there is 4 meters of it