It looks identical to a chuck I bought from Topeak so maybe they have spare gaskets.
Thanks. I've sent you an email to the address you gave me in the PM so hopefully that will sort it,
Genuine parts from the 70's. All prices include postage.
Shimano Dura Ace derailleurs; front mech, rear mech, downtube shifters, downtube cable guide and derailleur hanger £30 SOLD
Weinmann side pull brake calipers £20 SOLD
Tange Allez headset £15
Never seen a QR rear wheel for track frames with 120mm OLD. I am not sure they even exist. Nearest would be a QR wheel for an old 5/6 speed bike with a OLD of 126mm which I guess could be made to fit with a little brute force.
My LBS has a chart on their wall with about 50 different derailleur hangers which gives you an idea of how it is.
I assume you’re talking about the left side bar end shifter controlling the front mech. This is friction controlled not indexed. So I guess you’re saying the friction is not holding and the spring in the front mech is gradually pulling the mech over and the chain moves to the small ring.
So, you need to take apart the shifter and see if it is assembled correctly and all the parts in working order. There should be an exploded diagram of the shifter online, googling will help.
Try the classified forum where people ... err ... sell stuff 😉
Interesting rear cluster arrangement there - never see that before.
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