Ah, I thought you were referring to a crown down the lane. As to the highest point of the lane to the lowest point, it's incredibly small. Not enough to make a difference at all. My grandmother managed quite a few centers in her lifetime and at one of them they had the grooves from years of use. The center also got shut down due to it and ultimately led to that center's death.
Lack of proper resurfacing led to sanctions being removed, which led to leagues leaving, which led to ownership realizing that they had to get the lanes within specifications, which led to them realizing the cost was way to high, resulting in the death of the center. (How's that for one really long sentence? Lol.)
Anyway, it's something you won't find nowadays. If you do, your local ABC association is not doing thier jobs and haven't been for quite some time.
Yes doctor, I am sick.
Sick of those who are spineless.
Sick of those who feel self-entitled.
Sick of those who are hypocrites.
Yes doctor, an army is forming.
Yes doctor, there will be a war.
Yes doctor, there will be blood.....