Exclusion key for a 400 series 5 line key phone.

[Babybearjs]

I was doing some house cleaning in my shed and came across a hook switch that went to a W.E. 465. it was designed for the old 1A system and so I did some switching of the pileup contacts from 4 wire to 6. just swapped out the contacts from 2 different switch hooks to update the exclusion key version. anyway, I was going to change out a switch hook on one of my 464's and noticed that there was NO ROOM for the E1 through E4 contacts on the key switch... does anyone know how they made the 465's for a 1A1 system? I think they had to use a piggyback terminal strip, but I'm not sure. anyone game on the question??