We extend to you a cordial "WELCOME ABOARD !" Come on in, make yourself at home, we are a friendly group of enthusiasts, and we also appreciate the classic Chris Craft Roamer, Corsair, and Lancer boats too , as they are all on the same family tree and share much in common !
Here's the stbd wiper. I don't know if it's the same arm as others (if it's original).
Notice how the arm doesn't apply any pressure to the blade. Even if this were a straight blade, it wouldn't press against the glass.
The point where the wiper arm mounts to the motor has zero clearance. You may be able to see in the photos below where the arm has worn a little groove in the gelcoat. This is why I can't see how the wiper arm would come off by lifting off of the motor spindle. By the way, the only reason I wanted to take one off was so that I could figure out how to service/adjust it to press more firmly against the window.
The part of the arm rubbing against the gelcoat is plastic. I tried to gently pry it off, but it's pretty weather-worn and I didn't want to break it. If the plastic part could be removed, I think I could use my wrenches on the nut. As is, my wrenches are all to thick to fit/get to the nut.
Here you can see the nut better. It's 3/4", but very thin. Not sure how I'm suppsed to get to that. The port wiper arm has the kind of nut that is circular on the outside with a rough texture... for fingers or pliers I suppose. The point is, the port side is different and looks even harder to get off.
I was speculating that the springs may be worn and need to be replaced. Or should I be replacing the entire arm? There are a few stress cracks in the metal parts (may not be visible in the photo), if that changes your recommendation.