The original Loeffelholtz quick.reloading crossbow from 1505 seen reconstructed here :
That original is a bit complicated build , with the lever hidden inside a hollow tiller.
So here is simpler design, moving the levers outside the tiller is now basically just a square stick:
The bigger one pulls about 120# with 165mm power-stroke, 48cm total length.
Smaller one is ~80kg/50mm (180#/2"), 23cm long.
I did not bother to develop these further, but they work. If somebody is interested. Compared to a zhuko/border reiver type top lever these are less efficient, since there is more friction due the push bar pressing against the tiller.
The advantage is a longer lever with shorter total length. Which obviously can be useful feature in a small pistol.