I use this one. It is safe, easy to use and I never had the feeling that a false movement means my death. Nevertheless I have respect of this task but I used it a few times now and had no issues!
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The benefit of this compressor is you can it use on many other vehicles with this type of suspension.
It is used by the same procedure as the other forum members told and similar to the archaic self-made Ford compressor. I chose the above compressor because buying and shipping the Ford compressor would have cost me too much and I like it when you can use tools not only for your old Mustang...