Irv said
Another aspect of the luthier trade of which I have no clue.

I would like to create a gently sloping dome end on my pegs.  I thought of three ways where it might be done.

I could drill a hole at the center of a wood plug, ream it with a peg reamer, insert a peg and file it in a lathe (the plug diameter being larger than the peg flattened projections).

I could cushion a piece of sand paper on a wad of cloth and hope that a curve would form from the deflection in the sand paper when bearing on it.

I would try to place a piece of adhesive backed sand paper in a small soup dish and sand in a curved peg end in this manner.

All this is theory.  Any wisdom from someone that has actually done this would be appreciated.  

--  @Irv -that's what I did (red highlight) - seemed to work just fine.

@bocaholly - makes no odds really - it is (I suspect) simply aesthetically pleasing, making the peg protrusions look just like little "bumps" on the peg box outer walls.  I mean, that's fine when the pegs are new, but they'll eventually (over time) wear-in and protrude once again - mind you - if driven by some sort of compulsive disorder, you can always trim them down and round them off again once every few years of adjustment ! LOLOL  -  P.S.  I only bothered doing it since I have gone the whole-hog and reamed out a pegbox, shaved the pegs and cut them to size, then thought  - Oh - let's make it look pretty !  The sandpaper on a cushion of towelling worked fine !