kfconcept
There are two types of FD mounts
FD/FL Breech-Mount (with a silver ring, you need to rotate the silver ring when attachment and removal), breech-lock mounts are identified by the silver ring
New-FD Bayonet Mount, bayonet mounts are identified by a red dot next to the lens release button
Here are the steps to install breech-mount version
Operating the adapter
Canon Fd To R Adapter Sony Auto-lock Shoe Adapter Canon Breech Lock Adapter Canon Fd Adapter Lock Ring Remove Idx Canon To V-lock Adapter Lens Mount Adapter Aperture Lock Nikon 50mm Lens Adapter 1 Bayonet Or Breech Mount Lens Sony V-lock Battery Adapter Sony E Mount Lense Won't Lock
Polarized Lens Filter For Solar Eclipse Canon 3000d Lens Mount Canon 35mm Ef Mount Canon Fd Eos Adapter Edmika Eos M100 With Adapted Canon Lenses Dsc H2 Lens Hood With Adapter Ring Nex 5n Lens Adapter Nikon 5100 Lense Mount Promaster Pentax K Adapter Laowa 12mm F 2.8 Sony Fe-mount