As can be seen in the photo, replacement pins are not asper original and also looks like the material is cheap.

Is there a How to replace these on the forum?

I've had a look in the how to forum and can't see it listed. But I remember various threads on it if you do a search. Sorry my google fu isn't working here now I'm getting olderer.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

https://www.youtube.com/watch?v=ICTewlYZWIA

I got a 5/16" bolt and machined 3/8" on the end to a bit under 1/4" to push the new bush in. He says he just tapped it in.
I seem to remember having to either use a reamer or lapping in the pins with valve paste as some were a bit tight.
Make sure the pins get driven in all the way and are solid, I had one of mine start spinning and I had to replace it after the assembly so I now have a silver pin sticking out of one of my hinges because I'd already painted the car

The bushes are the most important thing to get right. If you get too aggressive, they will cave in a little, which will then fight the door pin as you push it through.

I select a pin punch with the same inner diameter as the bush, slide a washer on before sliding the bush in, and tap the bush into the receiving journal. This prevents the bush from deforming.
When you assemble the hinge back together, the pin is pushed in. I use my bench vice as a bit of a steampunk press to push the pin in nice and flush.

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SooperDooperMiniCooperExpertEngineering

All garage work involves equal measures of enthusiasm, ingenuity and a fair degree of irresponsibility.

There is a tool, basically like others have described - https://minisport.com.au/products/mini- ... a59e&_ss=r

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ex-NSW Police 1970 MK II Cooper S
VMCI #43

The bush is 5/16" OD. If the pin has worn right through the bush and into the hinge, find another hinge to repair, its toasted.
Although I did once repair a couple by making 9mm OD bushes.

Edit
I just took my old RH top hinge apart. It had a custom bronze bush, 3/8 OD. Worn almost through. I'll machine a new one from LG2 bronze and fit a new pin.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.