The Bondhus T20 Weighted T Hex Key is a HUGE upgrade from the stock star key for fastening the jaws on that comes with the Pro-Tek kits. The handle is weighted, so you can start the screw, spin the hex portion between your thumb and forefingers to quickly run the screw in and out, then just lock with the T-handle. This will probably halve the time you spend changing jaws.
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