Originally Posted by
Charlie Plesums
You have answered the most important question - you must have a mattress weighing at least 65 pounds as the "counterbalance" and if it is too light, the instructions suggest adding a piece of particle board under the mattress.
Your picture shows the piston correct - with the fat end up, and the internal rod down. I don't know why it makes any difference, but the instructions are very clear, and emphasize it repeatedly.
I have made several of the beds, and have the instructions. If you have more questions - drop me an email.