Installing the indexing stop nut
With the indexing stop nut, the product is adapted for drilling and countersinking a hole with high precision in a single operation.
Required tools
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Vise
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Open-end spanner
 
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Fasten the drill in a vise with rubber pads.
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Remove the spindle guard from the spindle.
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Remove the depth ring from the spindle using an open-end spanner.
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Install the indexing stop nut onto the spindle by hand.

Note that there are 4 metal lugs inside the nut. These lugs need to be eased into the 4 corresponding grooves on the spindle when attaching the nut.
 
