I'd be interested to hear speculations on the disadvantages of the way I described. I used a larger than 1/16 pin of annealed copper. larger because with smaller dia. copper it is too easy to bend (pins are bent in peening not from shear of open/close). I like copper more than brass btw

It's softer and easier to spread into the counter sink. I have also had to remove these same pins and I can say the swell from peening extends quite a ways, there is no danger of it coming off even with substantial filing for flush fit. I see no advantage to sleeving or use of flush washers. These increase the potential for splitting natural materials like wood, bone. horn

There is no hard finish to maintain so you can just restore when adjustments need to be made. I have many unfinished wood items that I have lived with for many years. There are advantages and disadvantages to everything- degradation and wood movement are not serious issues with proper care and appropriate compromises. Stabilized wood and, or hard finishes are not a necessity for razor scales