Loren

Here’s a tip.
in your photo you can see an arrow on the anchor bolts.
Before you take anything apart, mark the shoes and mark where the arrow is. Since it is so easy with phone cameras take a picture as well.
After you change the cylinder (s) put everything back the way you found it. Shoes in the same place and arrows pointed exactly as they were.
This is the only way you can get the adjustment right without the special tool to center the shoes.
You might scan the shop manual before you start to visualize what I am talking about.

Here’s a tip.
in your photo you can see an arrow on the anchor bolts.
Before you take anything apart, mark the shoes and mark where the arrow is. Since it is so easy with phone cameras take a picture as well.
After you change the cylinder (s) put everything back the way you found it. Shoes in the same place and arrows pointed exactly as they were.
This is the only way you can get the adjustment right without the special tool to center the shoes.
You might scan the shop manual before you start to visualize what I am talking about.

Well....On my 49 the switch is part of a cable that connects to the wiper motor.
I can't imagine it is much different on your 48.
To remove the wiper motor you would take the switch out too as it's easier to then remove the cable.
My parts book says: code 23-67-188 CONTROL, Windshield Wiper 1941-48 All with Vacuum Wipers P/N 898-522
That should get you close. The code will tell you what section (23) of the parts book to look and the location.