This mount was designed to modify and adapt a nFD or FDn 28mm f/2.8 and nFD 50mm f/1.8 lenses to use it with EF DSLR Cameras, along with these part:
Aperture arm for nFD 28mm f/2.8, nFD 35mm f/2.8, nFD 50mm f/1.8 and nFD 24mm f/2.8:
http://shpws.me/S9cv
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