Do I really need the heli-coil installation tool? Can't I just use appropriate size bolt with a jam nut to install the insert? Thanks, Dave

 

I like to use the tool and it also will break off the tang when you get it inserted.

 

The tool allows the insert to shrink to fit in.

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If you use the bolt as the install tool the coil may only go in a couple of turns then the tang breaks off and your screwed. The install tool is smaller than a bolt and allows the coil to tighten up around it and shrink the OD as it goes in.