So you don't know...
The round one is use during the girl shown with client. The client seat on the stood and the girl can have her hand in that gap to clean up the crack and little general. Very limited services can be done.
THe one ALG call the deluxe is quite different. The girl can do the same thing as the stood but the bigger hole if for the girl to slide herself into the stood while the client is still sitting on it. The most common service with the chair is rimming and other type of prostate service.
So where your girls do the Nuru? on bed or in the bath room? How many rooms have you change since Vic's time and yes please show us photos.