Hp-41C card reader - dead

[Vintage63]

I'm having a go at it again after 2 years.
Unfortunately the coaxial cable can fit over the worm gear, I have to machine it slightly, but is too big to fit snugly on the motor axle.
I removed the gunky stuff that was on the 'big' end of the worm gear.
Can I in some way 'glue' the worm gear over the motor axle with white glue to give it a bit of flexibility?
Attached a photo of the motor and worm gear as they look right now, not secured.

   

Thank you
Marco