Yes.
Motor serial number is: 2B151536, Model is 115F631D. The fore-and-aft slop was there from day one, 3 years ago. The manufacturer is confused, and claims that they always use Mercury props. This is on a 55-foot Sightseer pontoon ferry, that runs about 68 hours a week, and does a lot of backing. We'd damaged a prop and needed a replacement; I ordered and installed a 16Dx11P, 3-blade aluminum, [FONT="]78112A45 prop, which came with a hub kit, and it fits perfectly. We had the damaged prop fixed at the local prop shop, and when re-installing it, used a 835257K9 hub kit. I didn't personally install the hub kit, so I can't confirm 100% that they used it, but that setup still has the fore-and aft slop. The original props are marked [/FONT]J 16 x 11P, and has an M in a recess. I assume that is a Mercury prop, but was surprised that there isn't a part number on the prop. Normally Mercury props have the part number stamped on them right where the pitch is on this one.
In the end, I suppose I could just order another 78112A45 prop and hub kit, but then I will want the original props as spares, and will want the correct hubs so they aren't sloppy.