The cure for boredom is curiosity, there is no cure for curiosity, so I estimated the specs of your press
Looks like a MA of about 3.5.
The weight of 2 2x4's 40 inch long is about7.2 lbs.
The plunger is about 1 lb
Then your minimum pressing weight (no weights on the lever arm) is about 13 lbs.
Maximum pressing weight is about 1/4 the weight of your house.
GREAT FOR CHEDDAR!