You have to buy a whole new handle.
Smart 450 door handle cable.
1998 2007 smart spare part numbers for comparison q0001973v005000000 3 06 01 product information.
Comes with silver brazed end piece at door handle end and a unique special design thoroughly tested and easily fitted grub screw end piece at lock lever end.
Obtain a new cable from smart part number.
Due to lack of good and regular maintenance the 450 door exterior cable tend to snap.
Or you could buy a 2nd hand handle from ebay and hope the cable is ok.
450 interior handle cable.
Route the cable through the door to the latch and push it into the door trim clips.
Fine nose pliers to get the ball shaped cable stop back into the internal handle.
I was able to open the door by rolling down the window using a coat hanger to catch the cable i.
Smart 450 fortwo cable pull door opener cable pull bowden cable door handle 0001973v00500000 bowden cable for inside door handle fits left and right use w450 450 fortwo city coupe cabrio bj.
Breaking strength of this stainless steel repair cable is about twice that of the original smart carbon steel cable.
Outer door handle repair cables are now available for the smart 450.