I like to land the car on jack stands,
Disconnect the plunger from the bottom of the car
Open the valve and land the plunger
Disconnect the oil line
Modify a end cap for your oil line
Remove the jack head
Fish a copper tube down to the bottom of you casing
Put your Jack head back on
Start adding air pressure...
Thanks JKH. I had an idea like this, but wanted the boards ideas too. Most of the time these days, rams that are set into the floor is yesterdays technology, with side acting rams installed today. This can a little easier to do to, get the oil out of the ram with the oil line near the bottom of the caisson.