Alternate track jack
I have had the origional track jack before (need another one now) but have found the track jack issued with the M113 APC works far better and you don't have to be afraid of breaking the origional. The two claws have to be trimmed a bit but the force vs lack of effort available from the screw type mechanism is phenominal and there is less chance of it slipping than the origional. Plus one can use an impact gun on it so track replacement is very quick.
With many of the M113s destined for mothballing or targets, it isn't too hard to come up with these if you know anyone in a unit which holds them.
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