On to the custom upper arm. The lst2 hub uses 4mm hingepins. Same diameter as the stock savage hingepins.
So I am thinking of using the savage X SS adjustable upper arm kit with some mods and a new turnbuckle.
Have a look at this pic with my notes on it:
The nomal end hole that has a ball end is too big for a 4mm hingepin. But the next hole is slightly less than 4mm, so it can be enlarged to fit. The area I have marked white would be removed. This will require a 60mm long m5 thread turnbuckle. About 10mm of the turnbucle on each end goes into the plastic ends.
Spacers will be required to shim each side of the end where it connects with the lst2 hub. This will be nice as the shims can be moved to alter the caster.
Off to look for a suitable turnbuckle...