It appears that most modern chainrings have a 10 mm hole with a counter sink to accomidate the bolt head, thus centering the chainring bolt in the hole. What do you do if you are going to install a chainring guard that has a 10mm hole with no counter sink?
I know you can flip the chanring bolt and put the nut on the outside as the nut's OD is 10mm, but what do if you want to keep the bolt on the outside? I see that Campy makes some kind of shoulder bolt, but it seems to long for the project.
I thought of taking an aluminum chainring nut and cutting the width down to just a little over a 1/16 inch thick (or whatever the charing guard width is) and then screwing that onto the chainring, thus making a chainring bolt with a shoulder.
Seems like a lot of work, but I have a jewelers saw and needle files, so doing 5 would not be the end of the world. Just wanted to know if there was an easier way.