Is the Bore larger or smaller than it was at the time of the Sealing?
The same size (95% sure).
So, are the seals, even in their weakened state, the reason the Bore has not grown any larger?
As far as I know, yes.
If you are viewing this on github.io, you can see that this site is open source. Please do not try to improve this page. It is auto-generated by a python script. If you have suggestions for improvements, please start a discussion on the github repo or the Discord.