Don't you hate it when you release the jack pressure on your press and it retracts all the way back ?
Me too !
So built this stop that prevents that.
It's two tubes nested and bolted to the lower table- the inner tube has a series of holes 1/2" apart.
To set it allow the table to come up just enough to remove the part you're pressing (or the next hole) and insert the pin.
Now you don't have to start from the top again for the next part !