virtually no twist, only the oil film gap between the sliding part and the fork internally - the problem on the front is that the pin has to go so far into the sleeve to actuate that the roll pin hole goes in too so the usual method of popping a 2.5mm allen key in the roll pin hole and some gear oil in the diff lock switch hole and gently reaming it back into operation with a straight in out motion doesn't work, you'd have to make a slide hammer adapter and fit that to the pin using the roll pin and do it that way, I tried once, made the tool, wasted a couple of hours of my life and still didn't free it, if you are that far in then it's less than hour to have the diff on the floor and a cup of tea and then take off the end cover and strip it out, ream it up in the hand and then reassemble, change the oil while you're at it, free the filler and drain plugs to make it easy next time, and do any brake pipes in the vicinity that might need doing in the next few years to save the job of stripping it out again or working in tight space sorted
put it this way even CJ would take out the diff to free the diff lock on the front
