Relatively "easy" following the excellent write-ups in this thread, Phils and belfastguzzis.
Also helping is adhering to "RULE NUMBER ONE OF V11 TINKERING": "Thou shalt always remove any and all parts from thine V11, even the parts thou thinks must not be removed, for they shalt need to be removed anyways, sooner or later, to get to the part upon which thy desire to tinker"
The old spring looked OK (but it isn't. See Chucks reply below.), but more compressed than the new one.
Road test report to follow once the weather clears.