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My mid-90’s custom Sonic mtb has an original Dia-Compe Aheadset (Dia-Compe invented the aheadset) which Helmut Berns picked up in the US at one of the big trade shows. It was probably the first one in the UK. It had a plastic top cap, which we thought was a bit cheap but it was deliberately made from plastic to stop people from over-torquing the headset bearings. It’s still on the bike today.
jj72
I had a questionable headset cap which i managed to destroy by tightening the preload bolt too much. It looked like a carbon weave but based on how easily it disintegrated it was more likely plastic!