Help with finding a proper cable release

[jorozcophoto]

Hey all,

Thank you in advance for your time.

I recently purchased a Wista 4x5 SP. It's an absolute beauty! I'm having an issue with a cable release I'm using - it fits in the lens itself but does not mount due to it not being able to bend when attempting to pop the lens onto the camera. I'll attach some images so it makes more sense.

If possible, I'd appreciate recommendations of a cable release that is small enough for me use while the lens is mounted to the camera. Also, adapters that will properly fit will be great as well!

Best regards,
Jeremy