Okay, I took pictures of another installation.
Start by grinding off the knob stud:
The window guide is about 1 1/8" wide, so your slider should be this size. I used a round piece of nylon, but you can use anything. The original sliders are rectangular. These are 1 1/8" in diameter and 1/4" thick. Not sure exactly what that is in metric. The hole doesn't have to be perfectly centered. These aren't going to roll. Countersink so the bolt head does not protrude.
Next, use a nut to hold the bolt tight. This keeps the bolt head from working out to contact the metal guide on the bottom of the window.
The hole on the arm will be slightly large. Not a problem. Better than being slightly too small! Three washers on top of the nut add enough space to give the correct clearance for the guide.
Save yourself the embarrassment of displaying your mistakes for all the internet to see.... Put the knob on the correct side of the arm, add a washer and a self-locking nut. You don't want it to work loose.
It should look like this, except that yours should be on the correct side of the arm.
A little grease on the moving parts. You shouldn't need to lubricate nylon, but it can't hurt, and these old metal parts with their corrosion from being near the beach would probably wear even good plastic. You'll notice that the slider is now correctly positioned.
Also, the bolt is slightly too long. You can probably use a 3/4" or 13/16" and eliminate all the loose threads. It doesn't interfere with anything in the door, but I don't really like having things sticking out of moving parts any more than necessary.
So far, it works great. Maybe in a few years I'll remember to come back and give an update.