I have also stiffened up my cheese press and it is now fully rigid and at these weights works wonderfully well. Though, I still cannot stop the twisting moment at the point where the upright meets the base at the higher weights.
The knit after the first press was wonderful the pressing weights and times, and these are force at the piston not the weight dangling on the arm.
4kg - under whey 15 minutes
4Kg - Under whey 30 minutes
15 kg - 2 hours
went out to dinner with friends..
15kg - overnight approx. 9 hours.
After press weight 1.3 Kg
Currently the little ripper is soaking in a nice heavy brine bath for about 8 hours.