Can you shorten handbrake cables?

[aerosam]

I just got some new handbrake cables for my (BMW) rear axle assembly and they are about twice as long as they need to be, obviously.

They are only sleeved halfway, as on the donor, the other half was inside the cabin. I can cut some length out of them here but how can I re-join them, as there is a threaded end that goes though the handbrake lever and is the adjustment point, which must be retained.

Thanks guys,

Sam.