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there used to be a sticky with all the how to restoration links for threads and supply stores.
I do not know what happened to it.
You can use the search for restoration threads and get all the info...

By my experience you are correct, most of the time there is no problem at all. The only thing that happens when the pin hole is oversized is the tang will have room to move up and down. When there...

before you unpin, try to tighten the pin.
If that does not work re-pin.
Sleeving does not always work well, if the pin hole is punched and is not striaght sleeving will cause the razor to close...