Brooch catches

Looking at these examples to get some ideas of catches I could use for my brooch. I noticed that there must be something that gives the pin spring which is made from a piece of wire pressing in the opposite direction (Fig.1) or from a spacer. A spacer just needs to raise the pin higher than the catch, figure 2 uses the wide jump ring and figure 3 has the wire bent into a spacer. Figure 4 was interesting as half of the catch curves with the shape of the brooch making part of the brooch design.

Figure 1
https://za.pinterest.com/pin/774971048370869197/

Figure 2
https://za.pinterest.com/pin/774971048370869186/

Figure 3
https://za.pinterest.com/pin/774971048370869427/

Figure 4
https://za.pinterest.com/pin/774971048370869237/