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My question would be why would you consider a hex key an improvement over a slot? As mentioned, when you loosen the retaining nut it takes no torque to rotate the adjuster. Standard long shaft screwdriver works fine, slot actually allows you to better see clocking as adjusting. For example, try a 1/4 turn and if way loose 1/16th if less. I like to use a dial indicator to measure clearance so I can usually make a logical guess (or could actually calculate) how much rotation is needed to end up with correct clearance.
john
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