Firstly i dont know what its called but i need one ignition lead clip, the part that clamps over the inner conductor then fits in coil/distributor socket.

Photo below, the brass parts. Lead is 8mm diameter.

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Buy a new lead --- part is easily enough available from usual auto electrical mail order suppliers but it is not worth repairing. Fancy expensive leads have no advantage over OEM leads none. in fact because they are an emission related part factory genuine OEM plug leads are required in the USA to be designed for 8+ years life.

[Edited on 19/4/17 by britishtrident]

repairing those silicone HT leads almost never works....just buy a new set.. be all of 20 quid at most.