One way you could do that (it might require significant rework) is with the use of a differential /planetary gear system.

The planetary gear arrangement with the sun-planets-ring might lend itself more to the endeavour

i.e. attach:

• the red shaft to the sun
• the outer (blue) tube to the ring
• the gear to the planet carrier.

One way you could do that (it might require significant rework) is with the use of a differential /planetary gear system.

The planetary gear arrangement with the sun-planets-ring might lend itself more to the endeavour

i.e. attach:

• the red shaft to the sun
• the outer (blue) tube to the ring
• the gear to the planet carrier.

There are a lot of asterisks, i.e. what is the rpm on the output compared to the rpm of the shaft and the ring, however, since you did any information I assumed that you wanted to transfer power/torque.