The gearshift cables are clipped in a bracket close to, but difficult to access, where they attach to the gearbox. Perhaps one of these cables is not fully home.
Myself use corteco pulleys, but think continental sounds as a good brand as well and should have lasted a long time.
Regards from Bornem
Rob
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75 KV6 2.5 Sterling automatic, 3x 75 CDT (2 manual + automatic), MG ZT 190+, 620i, SD1 2300S, P6 2000SC & TVR 350i