So I'm going to share my experience disassembling a column switch from a 1985 and a donor 1984. The initial plan was to just use the 84 switch but the parking light circuit and the turn signal switch where inoperable. I just needed the wiper arm. Getting the horn ring off was a little "scary" just pry carefully and evenly with two large screwdrivers and it will come off. You can see that there is a color difference from 84 to 85. The 84 (upper right) has black handles and the 85 has brown handles. The 85 has no pictogram for the lights when off. There is a small difference in the parking light switch shape also.

The 84 has 2 screws and 2 c-clips holding the plate and the 85 has 4 screws holding the plate on. Remove those and then be careful when removing the handles so you don't lose the ball bearings and springs that hold the switch in different positions. Under the wiper switch is a small white plastic spacer (I assume this activates the washer when you pull the handle). Don't drop it accidently or you will be searching for awhile trust me

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Clean up the contacts and reassemble.