What would be the big deal. Would be amazing the new conversations that may strike up.
But if it's a few 1,000th's off so what. It would be much closer then the gasket that's on there; and it can't be really too critical within a few 1,000ths as the silicone gasket sealant would end up about the same difference IMHO. Tomorrow I'm planning on doing it as the wife (my lucky gofer) is going to a craft fair in the next harbor this afternoon.
Go Slow
Sail Far
Stay long