This mount was designed to modify and adapt a nFD or FDn 17mm f/4.0 lens to use it with EF DSLR Cameras, along with these part:
Aperture Arm 3mm
http://shpws.me/MZvG
For more aperture arms please visit the store main page:
https://www.shapeways.com/shops/lensmounts
Follow this link to see the tutorial:
https://youtu.be/Jiv1HAlwF68