You go to a Mass center that operates outside of the Church's jursidiction, nay, not merely outside of but "over and against" it, as it were, in defiance of it.
Here you go again, Ladislaus, slinging around rash generalizations, like a 2-bit chef slings around day-old hashbrowns at a waffle house. You're like a politician who makes himself look good by giving a great 10 second "sound bite" but when asked for an in depth-interview, he can't explain his ideas with any substance.
1. These mass centers are legally valid, since they are allowed by Quo Primum. All novus ordo masses are illegal and sinful because they violate Quo Primum. Therefore, mass centers which avoid the novus ordo are the only moral and legal and salvific choice.
2. Canon law makes it very clear that "the salvation of souls is the highest law". Canon law allows AND COMMANDS the priests to provide the faithful with the mass and sacraments, even providing for cases where jurisdiction is lacking.
3. Quo Primum is clear that no priest can be forced (in any way) to say a mass that is not using the rite of Pope St Pius V. It also allows a priest to say mass using this rite for all time, without permission from any authority, since THE AUTHORITY COMES DIRECLY FROM THE PAPACY. So, in a sense, Quo Primum is a universal jurisdictional allowance for mass and ANY PART of the latin rite (even confessions and marriages, because the novus ordo's new rites, including confession/marriage, are new and thus, illegal).
(Sedevacantists, on the other hand, say that jurisdiction is non-existent for everyone, since there's no pope, so they don't have jurisdiction either, just in a different sense.)
You reject the Magisterium and the Universal Discipline of the Pope.
We reject the fallible magisterium, since it is in error in some cases, which we are allowed to do since it only requires 'religious CONDITIONAL assent'.
The fallible magisterium is not part of the Universal Discipline of the Pope/Church, because a discipline requires a 'certainly of faith' and a command 'under pain of sin', which the post-conciliar popes had admitted does not exist.