# 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.

WARNING

Make sure that the air supply is not connected.

CAUTION

Wear gloves to avoid personal injury because of sharp cutting edges. Only experienced maintenance personnel can assemble or disassemble the product.

Required tools

- Vise

- Open-end spanner

1. Fasten the drill in a vise with rubber pads.

2. Remove the spindle guard from the spindle.

3. Remove the depth ring from the spindle using an open-end spanner.

4. Install the indexing stop nut onto the spindle by hand.

   WARNING

   The indexing stop nut must be placed correctly according to the illustrations. If placed upside down, the whole product will be severely damaged during operation.

   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.