The first batch of the Indivision AGA 1200 could slip of certain types of Lisa, mainly the HP ones. Slightly sanding down the connector of the Indivision would solve this. About 0.5 mm should be enough.
Later revisions were, if I am not mistaken, either sanded down already or used as slightly lower connector.
My Indivision (early revision) also would not stay on, which was easily solved with the sanding down procedure. It is now firmly attached to the Lisa chip in my A1200.
