Conversation so far:
What happened in 1991?
My Brain Hurts (1991) for Lookout! Records, Weasel decided that he wanted to focus on singing and would no longer be playing guitar in the band.
why did he want to leave?
After the break-up, Weasel and Jughead formed a new band called The Gore Gore Girls, and Ben.
Then what happened?
In 1991, the members of Screeching Weasel reunited for what was intended as a one-off gig to pay off debts.
did it last longer?
All of the band's members agreed to reform, with the exceptions of Brian Vermin and Douglas Ward.

Question: Why did they not?
Self-contained rewrite: Why did not all the band members not all reform?