Yup... your diagnosis is correct.
Since the E-brakes are activated by basically a big 1/2 circle loop of cable (between Left & Right sides) that's yanked tight by the E-brake pedal (near the transmission), there is too much slack in the loop for the pedal travel to "take up".
About the only solution is to bone-yard scrounge a Left side E-brake lever and complete the assembly on the driver's side.
They can't be that hard to find - GM used the same drum brake assy's for years. Take your RH lever with you and start digging. The LH lever will be an exact mirror image/reverse of the RH. I'll bet you could find a match up into 80's cars.
Since the E-brakes are activated by basically a big 1/2 circle loop of cable (between Left & Right sides) that's yanked tight by the E-brake pedal (near the transmission), there is too much slack in the loop for the pedal travel to "take up".
About the only solution is to bone-yard scrounge a Left side E-brake lever and complete the assembly on the driver's side.
They can't be that hard to find - GM used the same drum brake assy's for years. Take your RH lever with you and start digging. The LH lever will be an exact mirror image/reverse of the RH. I'll bet you could find a match up into 80's cars.