At first I was going to leave the convex molding plain, but as it progressed, the plain convex molding and shape was starting to resemble a car tire, with a fancy hub cap to me, so I decided it really needed the egg & dart.
Looking at the original, it is not a random repeat design as it might seem, it has an even 16 repeats of the egg & dart pattern. it became clear they placed an “egg” at exactly the 12, 3, 6, and 9 o’clock positions, leaving 2 repeats between each, so it was easy enough to find the four main points 12, 3, 6, 9, and then measure the distance between 2 points, divide by 3 and then use that measurement to find the remaining 12 points so they would all be evenly spaced.
I have the centers of the 16 egg points marked out now, and according to a 1901 book on ornament it’s clear from the little guide-lines at the top in the drawing which I accented- how they laid these patterns out center to center evenly. All of these ornaments and elements had considerable geometry and math behind them as should be evident to the reader when observing these 1901 drawings below.
The 1st one shows the basic layout of the egg & dart;
This one shows the layout of one of several variations on the common Greek fret molding design, it becomes abundently clear exactly how these were laid out so nicely and evenly using an even grid of squares! I assume at the moment the diagonal lines relate to some other measurement probably related to proportions between the sections of repeats;