the "keyhole" isn't dropping into the gear. they can get very worn so you may need to replace it. they can also bind which can be a *******!
it you check this it will only leave the keyhole jumping off the sledge and that i doubt.
i'd appreciate it if you had the manners to say hello and request info. seems to me that for a first post you need to show some more ettiquette. please add your location and bike in your signature.
regards
Taffy