As shown in the figure below, if you need to push 3 blocks, set "Push & Move value" to 3
The current version cannot set the moving distance and moving blocks separately, so if you want to move a few blocks, you have to move a few.
When there is no circuit system control, you can manually click the crane to start it. The following picture is clicked and the blocks is pushed forward by 3 blocks.
If you want to pull it back, you can click the crane again to return to the original position.
We can also use the circuit to control. When the crane receives a high voltage, the crane will start moving forward (same click effect). When it receives the high voltage again, it will pull back the blocks(same click effect).