[Spits] Swing Spring

[Alex Cherington]

I am looking at replacing my Mk3 Spitfire spring with a later swing spring. I
have the spring with the cage fitted with new pad and pivot bolt. I have
fitted a later anti-roll bar. After I built up the spring I tried a stud in
the cage. The stud does not seem very long in that there doesn't seem to be a
lot of thread going into the top of the diff. Does anybody know if the Mk3
studs are the same length as the MK4 How much of the stud thread should be
screwed into the diff? Thanks