Bike Bottom Bracket Adapter

thingiverse

To install a new bottom bracket on my messenger bike project, I discovered that a special wrench was required. Instead of spending more on the tool than the rest of the bike, I crafted one myself. My homemade wrench was created using a router and 1/2 thick HDPE (cutting board), designed for use with a 1/16 diameter mill. Initially, I employed a 1/8 end mill for the first pass, planning to refine it with the 1/16th mill; however, the part fitted perfectly without the final profile. The step height of this innovative wrench is 1/8 inch.