Christof,
I had that happen (on a tonearm without removable cartridge leads).
I lived with it for a good long time without the clip attached/soldered to the end of the wire. How, you may be asking

Put the bare wire end to your cartridge pin and carefully place the (unattached) clip over both the wire and cartridge clip. If there's friction to hold it on - your fine.
You just eliminated a solder joint.....no bad thing for meager cartridge voltages to leap over...you might even want to do that for all your leads

You just need to find away to have the wire in innate contact with the cartridge pin...the (now detached clip) is perfect to do that. No need to re-solder it...it costs nothing to do

(just a lot harder to get it to work than attaching clips at the end of your headshell lead)
Does this all make sense or did I lose you along the way?
John