Locking out advance with welds
Nope talking about rotor and cap terminal phase, at point of ignition, sorry to be difficult, please read my words, try to understand.
Maybe this will help, what happens if you clock the distributor gear a tooth, then readjust timing? The rotor phase to cap stays the same. If you lock top hat to inner, or outer part of slot, same happens you are moving both rotor and reluctor on shaft. Then rotating distributor, adjusts but no change in rotor to terminal phase, because ignition event is timed by pickup location, that has not moved in relation to cap. Maybe you are thinking rotor and reluctor are clock different with where you weld, but the rotor index slot, and reluctor pin index are on top hat.
I guess we are done, but feel free to prove me wrong. Booger up a couple old distributors by welding them up different, and view rotor with timing light, post them pics.