1969 Formula S owners needs help with Variable Speed Windsheild wipers

Bill Aldridge said
I would love to see your disassembly!

I think that's a 3 speed. But you can see the marking?
Not stopping is what is odd to me.
Disassembly is not really that hard.
And mine really needed cleaning and new grease.
Edit.
Your's MAY look different. May not.
Pull the cover and you will see.