Hp-41C card reader - dead

[Erik-M]

Could be a battery problem, or the motor draws too much current.
See if the little dot on the axis (the head with the screwdriver slot) of the gearwheel is facing in the opposite direction of the motor.
If not use a screwdriver to turn it, it should draw less current.
In last case if its not the battery and turning the axis doesn't work, put some moly grease on the tip of the axis and a drop of sewing machine oil (check if proper for plastic) on the wormwheel.
Check also if you used the right size o-rings, I bought mine on ebay and they are fine but I heard of sellers offering the wrong size.

Maybe more experienced repairman have more ideas.