Those large chin spin jigs are all I have for poured in.Name: Resized952020121095100540955058.jpg Views: 393 Size: 96.2 KB On my small jigs I use spring collar and switch blades as I want.Name: IMG_7010.jpg Views: 350 Size: 71.5 KB With these I fish plastic as I have no idea how I would use feathers. If I want feathers or marabou I use pony head jigs and tie my own. What I like about the spring collar is I can change tail and blade very quick and get back to fishing. Here is the mold I modified.Name: underspin2020.jpg Views: 380 Size: 85.0 KB Hope this helps you with your mods.