In the real world, those knurls would not even be modeled anyway. There's no need. Just model the plumb bob geometry and then on the detail sheet, select a good view of the part and draw a few reference lines to show the extents of the knurl. Then simply call-out the knurl spec with a leader note. That's it. If you get questioned about it, just say, that's how it done. It's similar with threads. Nobody draws threads unless they're and integral part of the design or modified in some special way. That's whay, CAD delevelopers came up with the term "cosmetic threads" and developed a special way of handling them.

Jim232