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Welcome to the journey! You will love this forum; there is a wealth of info and help here. Don't ever hesitate to ask.
The only dumb question is the one you don't ask; you can't get an answer that way.
I'm one of those very happy with the Maverick ET-732.
Had mine for almost two years and love it.:D
At the time I replaced the gasket on my large (also, thanks to @RRP for the wonderful instructions), I did not remove the dome. I just didn't feel like taking that on, particularly since there was no gasket going on to the dome.
It completely changed (improved) the performance of my egg,
If it ever needs replacing, I'm right back to Rutland (and Ron).