I did use the long bolt method Adrian, but still found I needed to compress the springs by over an inch to get them to fit between the hub and the upper mounting.
Oh I bet that was a tense job

, do they normally have to be compressed that much. I did need to on my +8?
I am planning to replace king pins with hardened chrome and bearings from Mulfab, and probably putting some slightly stiffer ones in, oh what fun!