Hope it is a rear spring, that will save about a half hour.
If the spring is totally out of the lifting arms then the only way I know is the completely remove the rear or front set of springs to prevent putting a kink in the cable. It is not that hard to do, just very messy thanks to all the grease in the cable/spring track under the trailer.
At each corner under the trailer you should have a bracket such as this...
Some connect via horizontal bolts to the outside of the frame, some have vertical bolts to hold the bracket to the trailer
When you remove the two bolts, and pull the bracket down you will see the spring. However, due to the spring being in the steel conduit you can only lower the spring so far or else it will bend. (Also where oil should be applied each year to help lubricate the spring inside the conduit.)
So, the only way I know of to completely remove the springs is to remove the steel winch cable. (FOR THE REAR). You remove the bracket at the rear of the track (under the trailer) that holds the rear springs' conduit tubes and cable into the track. Then pull the spring conduits and cable out and lay on the ground.
Then remove the rear brackets at the corner for the rear springs and carefully pull the springs completely out of the lifting arms.
Then inspect the springs and if ok, insert correctly in the lifting arms and install the conduits and cable back into the track.
If it is a front spring, you will have to remove the rear, then the front springs.
I also believe if it is a front spring problem, you MIGHT have to replace the entire cable. I cannot say for sure, since when I replaced the cable, I had to cut the old cable to feed the new cable through the front springs conduit. But that was because I did not want to remove the front springs to replace the cable. So, if the front springs are coming out the cable might not need to be replaced....GOSHEN can tell you that.
However, if you have an older trailer, and you are already under there, covered in grease, I would recommend replacing the cable; its only about $25.00 (+/- a buck or two).
You can order from Goshen. The model number of the trailer is supposed to be ok, plus a measurement.
HOWEVER, when you get the replacement cable check it very closely for the correct cable. When I ordered my cable it was a nightmare. I gave the lady the measurement of the track to the rear of the trailer (or pulley), plus the model 228BH and she sent out a cable. It was the wrong size. (The distance between the middle and rear pusher plate was off by 8 inches.)
I called, noted the problem to a different person, she laughed and said the other person wrote the order wrong. Sent me another cable, and it was the same as the first one sent. I actually sent an email to the president, and to give him credit, he called, I told him the problem and he walked the correct cable through the plant and I received it two days later