easy to turn the motor from the output shaft relative to the gearing reduction
to get a 100 to 1 reduction would need several gear steps

the one i linked to is worm drive reduction
very hard to turn the motor from the out put shaft due to the inherent drag and massive reduction of the worm drive
to get a 100 to 1 reduction is easy to do with a worm and a 100 tooth cog

this is why i was trying to get you to get 90deg worm drives
