That's the one thing I definitely dislike about the adapter, regardless of how well it works.
I wish the installation fittings were wingbolts. It'd make swapping modules a cinch. In fact, if I can get a really tiny screwdriver in there, I'll get some wingbolts of the same threading and keep my timing intact :p
You know...I wonder if the screw facings have oxidized, and thus caused a gap in the ground? That'd stop any HEI module in its tracks.
-Kurt