Strut compressor. By Metalworking Tools TV. 4:41 video:
https://www.youtube.com/watch?v=DiXrIEPLVCs
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Strut compressor. By Metalworking Tools TV. 4:41 video:
https://www.youtube.com/watch?v=DiXrIEPLVCs
Curious what that strut is off of? Not sure this is a universal strut compressor but it's a novel approach to spring compression. However this a bit dangerous to work with a single hook...most I know of use 2, 180° apart.