I understand that a new Altar servers' Sodality was set up last weekend and that details are available here.
I'm not joining. I joined the Archconfraternity of St Stephen forty-five years ago and I use its 1962 Handbook to this day when I serve. There is no reason to set up a new organisation, other than in an attempt to gain some form of "ownership" of the Extraordinary Form in the Church in England and Wales.
I'm not a member of the LMS either, for similar reasons.
And I normally attend OF Mass, even when I know by whom and how it's going to be celebrated.
Anything which tends towards the fostering of disunity ought to be shunned.
What's all this about? This was in response to what I think was an intemperate message telling me (as it seemed to me) that I had to join this Sodality if I were to be considered a "real" 1962 EF Mass server. I responded "assertively" and was then made aware that those attending OF Mass when EF Mass was easily available were not considered necessarily suitable for serving at EF Mass. Lots of paraphrase here!