We let him speak for himself. AMK reader Jan Bijman puts it this way. And that was in addition to a question that he as an AMK reader sent to the editors. We give you the piece of text that is relevant:
… I myself am quite handy with the material polyester, I copy old-timer parts, for example for classic mopeds.
With thanks and vgr. Jan Bijman (nh) Phone: 06 20518219
On the photo we see neat FS1 side caps.