The company I used to work for used cranes to install / remove engines, when the crane drivers went on strike, we were forced to use the boot strap method, problem was 1 & 4 chains couldn't reach the cradle to pick the engine up.
Solution, fill the left wing with fuel to lower the pylon enough to hook up the chains. We then transferred the fuel to the other wing plus some to account for #1 and did the same for number 4, worked like a treat A/C left on time! Looked similar to the pic provided.