Well I've been reading this thread and at the moment it's totally incomprehensible to me...
I really need to read up on this I guess. I don't want to hijack this thread ALGA but will the MX5 build suffer the same fate...
Here's a photo
I don't believe anybody has finished a MX5 build on here yet so it would be very nice to know.
I believe Nathan modified his top wishbone to overcome the clearance issue with the steering rack extensions fouling the bottom wishbone and moved the top threaded adjuster rewards.
He stated this helped his self centering as well as a result.
Obviously you are looking for a cost effective solution to the problem but would a new top wishbone as Robo suggested be the only option??
Johno