Bow pulpit integrated bow roller

It looks like the roller pin is riding in the glass.
We need to make a bushing for the pin and lay that in the glass.
Wish you were close. Here in the swamp, we custom make these lil thingies in the shop while enjoying hospitality.
New still close by, Lots of hospitality been flowing lately. I'm even getting more stuff done on our own boat..

Source?
Were red-necks, we make our lil things. If you were a customer that wanted it rite and had bux, Then we source.
If you have the ability and don't mind risking a finger or two, than we make.
Making it your self ads pride to your ship and usually last longer. A little red on the deck ads to the racing stripes.

Give me a minute to get a fresh clear refreshment and I'll type up some ideas.
In the mean time, all else can still offer ideas.

What size is the pin?
Would you be heading thru Florida anytime soon?

You don't see the pin is always going to ride in the glass. Aluminum tube will wear quickly against the pin because of the load and abuse it will take.
When the aluminum tubing is just sitting, the scored alloy will just weather and dissolve.
Trailer pins are usually galvanized or zink coated. They are to large and wont last either.
Remember, this roller has to roll easy and take the ships load on the rode.
AND, to avoid any slop to keep the pulley off the inside glass any more, it has to be tight and captured under those screwed down caps.

I'm trying to find some cheap silicon brass stock or who makes the hardest brass plumbing fittings now.
Brain cells are rolling, my fast ones are working well as always. Just wish I had more fast brain cells left.

Next question to the OP; Do you have a drill press or have a friend/neighbor with a small drill press.
First easy idea is to buy a solid brass male plug and drill a hole the size of the pins. Hand drill will not make it.

3/8 ?? Is that the size of the pins or thru axle of the pulley? I have no specs yet.

Over think? Over complicating?
I'm just trying to find some simple hardware ideas for the pins to squarely ride in.
At the beginning, I mentioned easy DIY bushings that I hoped would help. Not a ship pile of hardware & labor.

Let me know if you want me to pursue my ideas.

Perhaps some plain old copper tubing of some size may help and come into to play to fit over the existing pin/axel and expoxy or Marine -Tex or Five thousand two hundred or.... You got it Postman! Get er done.