Since this is generally considered a permanent assembly, there would be nothing wrong with applying a little loctite to the boss and then tap into true using a good, round pin and careful indicator use before tightening the bolts. Most any formula would be acceptable, but by choice I'd use the green (can't recall the number off the top of my head). Of course, this would prevent the future adjustment I mentioned earlier. But it would be a solution.
Just for grins, I'll tell off on a former coworker. We ran multitudes of 'o' ring grooves in fairly small parts (1.5 to 3.o range). He cut one a bit small, and spun the lathe slowly while building the groove up with clear fingernail polish. As long as you didn't mic it to hard and scratch thru it, it would pass inspection. Naturally, being the good inspector I was, I caught him. But it is just lacquer, basically, and relatively hard. You could paint it up with some tough paint and use a little paper to bring it back down. If you miss it again, simply put some more paint on.
I have all sorts of stories where our operators tried to sneak stuff by inspection. Most (I hope) got caught, but I'll never know. I don't recall any rejects from customers on any tricks like that, so I guess all is well. Or if it failed catastrophically I never heard about it. Except for one.....on myself. I shouldn't have been doing that op anyway. I wasn't qualified at the time, but was stuck doing it. As a result, a large portion of a downhole string was lost in hole in Italy by Shell Oil. Our product liability covered the fishing, but I got relieved of doing that op from then on. I was very glad. I wasn't trying to slide anything by QC.....we didn't even have a QC dept at the time. We were too small.....4 man shop, every man for themselves. But we did grow. I got the QC job after a part I failed to deburr properly was rejected. The only inspector we had was called into the main office and terminated. I was called in next, fully expecting the same, but instead was told I was the new inspector. I was afraid to decline. So to QC I went.