TOPIC:

looking for that item in the picture, or assembly, either individually tensioning pulley, while I think about the possibility to carve it out of caprolon (polyamide 6)

Try this:

www.zed-parts.com/Z1300_parts_shop.html

I think carve clip of bronze

Privet Aleksey,

I have some rubber rollers (used, but in good condition) in my garage in Helsinki one of which I could sell to you.
Send me a private message with your direct email.

Greetings, Lauri