Jack The Gripper

This clever tool combined with the ESP spanner wrench is just the ticket for tightening all those guitars from "across the pond" whose out jacks just spin when attempting to tighten up, usually resulting in breaking a connection.
This saves me headaches every day!

Dealing with loose jack nuts has been the bane of my guitar playing life: unscrew the jack plate, while trying not to wreck the thread on the screws or slip and ruin the guitar finish. Struggle to get a thin wrench on the inside nut, keep it there while you tighten the outside nut and then reverse the process.
Although expensive [for people with my sort of income], Jack the Gripper works perfectly and, when you think of the potential for damaging your guitar in such a simple operation, it is definitely money well spent. It is also up to the usual Stew Mac standard, so should give you years of dedicated service.

Buy one! Use it. Kick yourself for not having bought it sooner!

How did I work without this? Like the ESP Spanner, I often wonder why you would NOT own one after using it. Installing/replacing jacks on Teles alone make it worthwhile--never mind the headaches I have prevented while working on semi-hollows and hollows (Gretsch, Gibson ES, etc).

Could not recommend more highly.