Insulated vs non-insulated jacks

The non insulated work in most cases as the metal on metal contact of the jack sleeve to the enclosure provides a solid ground connection. I’ve never found an appropriate use for the insulated types beyond maybe wiring a switched expression jack, but I still use the non insulated ones there too haha.
 
You can still use the insulated jacks, just make sure that you connect ground wires to both jacks and find a way to ground the case. One way is to solder a ground wire to the star washer that goes under the stomp switch.
 
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