Jig for trimming binding post screws (Chicago Screws)

After going to hardware store twice and accidentally buying 3/8" long binding post screws instead of 1/4" long, I got tired of going and decided to trim to length.
The screws are too small to hold to take off 1/8" so built this little jig sized for the post diameter. With care it can also be used to trim the screws.
Aluminum screws cut fast, in less than a minute.