Crank bolt modification
Inexpensive socket head crank bolts with integrated black plastic thread covers have been around for decades. These bolts accept a 8mm Allen wrench. The threads of all square tapered axles are a standard metric size so these bolts can be used on any cranks. And with the snap-on thread cover sleeves there was no need for a separate dust cover. A great idea. However, I always thought they looked bad on vintage cranks. So, I removed the black plastic sleeve from one pair and painted them with a "Bright Coat Metallic Finish" aerosol enamel from Rust-oleum. Not a true chrome like finish, but even after a single coating, to my eye it is much less distracting and a nice compliment to the non-anodized crankset. Further paint applications would likely produce a more shiny finish. Durability of the paint on this plastic base is questionable, but I am pleased with the initial result. Next photo shows better how this now almost disappears on the bike.
Crank bolt modification
Inexpensive socket head crank bolts with integrated black plastic thread covers have been around for decades. These bolts accept a 8mm Allen wrench. The threads of all square tapered axles are a standard metric size so these bolts can be used on any cranks. And with the snap-on thread cover sleeves there was no need for a separate dust cover. A great idea. However, I always thought they looked bad on vintage cranks. So, I removed the black plastic sleeve from one pair and painted them with a "Bright Coat Metallic Finish" aerosol enamel from Rust-oleum. Not a true chrome like finish, but even after a single coating, to my eye it is much less distracting and a nice compliment to the non-anodized crankset. Further paint applications would likely produce a more shiny finish. Durability of the paint on this plastic base is questionable, but I am pleased with the initial result. Next photo shows better how this now almost disappears on the bike.