To lengthen, you need to put the jack under the bottom of the lift arm where the four bolts are but leave clearance for the torsion bar then, jack it up until it is supported by the jack. Loosen the four bolts and jack it up some more so it slides up the end of the torsion bar until you have the desired length. Tighten the four bolts and let it down. I find it more accurate to measure between the two pivot points of the arm. That way neither the trailer nor the ground has to be level to get all four arms the same. Put one end of a tape measure on top of the torsion bar where it comes out from under the TM and measure to the center of the pivot pin on the top shell. To shorten, set the jack the same as before but after you loosen the bolts slowly let the jack down so the arm slides down on the end of the torsion bar. This is where you may have to use a hammer to tap the torsion bar up into the arm. That pivot pin for the top of the arm rides in about a one inch slot in the arm so when you were jacking up shell all it was doing is riding up and down in the slot and the arm. There is also about a half inch of play in the hole where the torsion bar comes out from under the TM. That is why the arm wasn’t changing length after you let The shell down.
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