You would be surprised how expensive these are to "make"
I have talked to a few plastics guys and delrin/acetel which is probly the plastic you would use isnt cheap, but getting it machines and bonded would make expensive and + minimum orders etc, ill talk to my plastic guys again and get a proper quote.
If there is enough intrest they might do a run of them.
you send guides they come back with nice new plastic.
only one thats not worth doing is the lower tensioner casue there cheap and would be a PITA
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