adjuct dial question

[Babybearjs]

OK guys... here's my dilemma. I have a black 1035 adjunct dial that's currently attached to a beige ITT 564. I want to attach it to a WE 564 from the 1960's but have the Slate-Brown soldered to the network. I pulled up the schematic for a 2500D to look at the wiring and noticed that the Slt-Bwn wire was still attached to the C terminal on the network, along with Org-Blk wire from the TT Dial. if I solder a spaded jumper wire onto the C terminal and then attach it to a spare terminal on the 636 keyset board along with the Org-Blk wire, the unit should work OK, Right? on these old 564 phones they have the 425 networks and the C terminal is always soldered. does anyone know when they upgraded the networks to have the C terminal with a screw? (time frame) I wanted to ask because in the ITT networks the C terminal is always set for a spaded connection.