Before attempting to use the RotoZip, refer to the RotoZip instruction manual so you can safely operate this power tool. To prepare the RotoZip for undercutting the door jamb you will need to use the following RotoZip parts:
• DRIVE BIT
• ZM3 ZIPMATE RIGHT ANGLE ATTACHMENT
• X-SHIELD FLUSH GUARD ATTACHMENT
• WOOD XWHEEL
Following the instructions found in the RotoZip instruction manual, first attach the DRIVE BIT to the keyless chuck. Next, attach the ZM3 ZIPMATE RIGHT ANGLE ATTACHMENT and WOOD XWHEEL to the RotoZip.
The next step is to remove the door so you can have easy access to the door jamb. Then cut a piece of 5/8” thick particle board (approximately 15” long and 7” wide). The particle board will aid you in making a flush cut. Place it directly against the door jamb with the RotoZip on top as shown in these pictures. Now you can undercut the door jamb and casings!