For those of you not familiar with SB M20-289A, or those who just haven't gotten around to performing it, here are before/after videos on our 1976 M20F.  We've been aware of the issue for a while now, but it was only within the last year that our original installation actually began to have the clearance problem described in the S.B.  Ordered the kit from Mooney, and installing the new spacers does make a significant difference. Before:   After: Video link https