Dear Alan,
When I started grad school. I thought I wanted to be an experimentalist (I later had a change of heart/ mind/ direction). My Thesis Supervisor wanted to stretch his equipment budget as far as he could, so I built some of my own equipment parts in the machine shop. I built nearly everything out of SAE type 304 stainless steel, and tapped my own screw threads.
If you play with machine screws enough, you quickly learn the standards. Note that some of these screw sizes have coarse, fine, or extra fine threads. A courser screw thread transfers longitudinal "change in velocity" faster than a finer thread does. But varying field strength requires varying screw threads.
OK - the fundamental electrostatic force falls off as inverse-distance-squared, but we can have dipole, quadrapole, etc. types of radiation that have non-isotropic distributions.
You still need varying screw threads to represent these varying field strengths.
Regarding photons, gravitons, "anti-photons" and "anti-gravitons", they are different - photons have an intrinsic spin of 1 h-bar whereas gravitons should theoretically have an intrinsic spin of 2 h-bar.
Edwin Klingman claims that there are only four fundamental particles and four fundamental fields. I like Ed, and we traded books, but the Particle Physicist in me doesn't see how four fundamental particles can work. It's clean and simple, but it's incomplete. Similarly, Jason Wolfe thinks that everything is made of photons. Once again, I like Jason, but he (and Constantinos Ragazas) cannot model fermionic matter with bosonic photons. Don't let "simplicity" lead you down an incomplete path.
Recall that my Quantum Statistical Grand Unified Theory says that photons and gravitons are different states of the Grand Unified Mediating (GUM) Boson. This allows them to be similar but different. You still have to explain the observational fact that gravity is weakly attractive, whereas electrostatics can be attractive or repulsive.
I've had a rough week. I had to put my 13-year-old dog "to sleep" this morning (she had liver cancer), and a drunk driver drove though my landscape and totaled my wife's 1986 Ford truck a couple of nights ago. I hope next week is better!
Have Fun!
Dr. Cosmic Ray