Possibly useful - 33:1 gearbox

[Dick Linn]

You might be able to use it without reduction by using some sort of cam arrangement - depends on how much you want to raise it.

I did see the exploded parts diagram of this. There's an internally toothed annular gear around the outside, and what appears to be two inner gears with some eccentric shaft. It's hard to see from the drawing just what is going on.