Norton clipper CDR 353 Operating Instructions Manual page 19

VERS.2015.05.19
5.2.11 Drilling using an extension rod
To make hole deeper than the tool length:

Make the hole for the full depth of the bit.

Take the bit out of the hole and switch the motor off.

Take the core out of the hole without moving the machine.

Unscrew the core bit from the motor axle and put it into the hole.

Screw the extension rod between the core bit and the motor axle. For 1¼'' back fitting
end, insert a brass or bronze washer.
Kit CDR 353 + NBM 351_MAN_EN
19