It is not really a cantilevered beam.

Here is the design as I have it figured:

At one end there is a support structure with an H shape, one end of the beam is placed under the cross member of this H, which is about 4 feet above the pressing table. A block can be placed under the beam to hold this end up to make positioning the cheese mold easier. The other end of the beam is completely free to move up and down. Again, a block is placed under it to hold it up until you are ready to let it come down.

A wooden block is placed under the beam about 1 1/2 feet from the secured end (a little less) that is long enough to press against the cheese in the form.

Now the beam itself has 220 pounds of dead weight bearing down with some degree of mechanical advantage. I want to know how that transfers into the pressing block so I know how much additional weight I need to add to the end.

I would try the scales approach, but I do not have one that would not be destroyed by the weight of the press.