One more thing.When I make a new outer can, I cut the length (becomes dia.) long enough to lap the ends.Then I seal and copper rivet the lap.This allows you to get a perfect fit and avoids making the original lock joint.Install with seam facing down and slightly turned towards front and it will work and look perfectly.
Thanks very much bkrsdoz for your very kind offer. Unfortunately postage to NZ is now ridiculously high and I would also be worried about it being damaged as it is fairly fragile……one of the problems of living at the “bottom of the world”, so I think I will have a go at making one and see how it turns out…….I will let you know how I get on.