So I have to find something that I can make a substitute fin from and then get it TIG welded onto the head.
Unless the welder were able to attach the replacement piece perfectly parallel with the other fins the repair will be quite obvious. Instead, a better job usually can be done by building up the missing material with TIG and "sculpting" it into the right shape. This is especially true when the missing piece is relatively small.
Yes I've had that done before on a Triumph twin head.
Quite successful but as I've got the opportunity to get one of the toolmakers at work to do the welding FOC I can only ask so much.
I suppose that I could weld it myself but I'm so far out of practice that I'd need a couple of hours practice first.
Not really practical when the job is a "foreigner" on a machine I'm not really supposed to be using.
I do actually own a spare A65T head from an earlier model.
I could use this as a donor but it seems a shame as it's a repairable head.
I'm thinking that if I can make myself a replacement fin, I could design a special clamp to hold it exactly in the right place during welding.
Yeah, maybe it would be easier just to build up a fin from weld.
Maybe time for a rethink ?
Maybe time to find someone with an AC TIG set in their shed ?