Too loose? You can open them up a little by spreading the blades out. Quite common for older jacks.2mm bananas but they do not fit well
I use them for testing with proximitors. They have test ports (circled in thumbnail) so the permanent wiring doesn’t need to be removed. The leaves on the mini plugs tend to break off when removing them and the body is much wider than the tip so they knock together and cause my connect to drop out. View attachment 55392